buildman: Switch ARC toolchain to the upstream version

Back in the day we relied a lot on Synopsys own build of the GNU tools
for ARC processors, but since then we worked hard on getting all our changes
upstream and for a couple of years now we have ARCompact (AKA ARCv1)
and ARCv2 processors supported very well in upstream GCC, Binutils, GDB etc.

And so there's no need to use Synopsys forks any longer, thus we remove
all the references to that form and use upstream components as majority
of other architectures in U-Boot.

Thanks to Tom for pointing to that left-over!

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Tom Rini <trini@konsulko.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

tools/buildman/bsettings.py

@@ -91,7 +91,6 @@ other = /
 [toolchain-prefix]
 # name = path to prefix
 # e.g. x86 = /opt/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-
-# arc = /opt/arc/arc_gnu_2021.03_prebuilt_elf32_le_linux_install/bin/arc-elf32-
 
 [toolchain-alias]
 # arch = alias

tools/buildman/buildman.rst

@@ -475,10 +475,6 @@ Setting up
       sudo mkdir -p /toolchains
       sudo mv ~/.buildman-toolchains/*/* /toolchains/
 
-   For those not available from kernel.org, download from the following links:
-
-   - `Arc Toolchain`_
-
    Buildman should now be set up to use your new toolchain.
 
    At the time of writing, U-Boot has these architectures:
@@ -1342,8 +1338,6 @@ Thanks to Grant Grundler <grundler@chromium.org> for his ideas for improving
 the build speed by building all commits for a board instead of the other
 way around.
 
-.. _`Arc Toolchain`: https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/download/arc-2021.03-release/arc_gnu_2021.03_prebuilt_elf32_le_linux_install.tar.gz
-
 .. sectionauthor:: Simon Glass
 .. sectionauthor:: Copyright (c) 2013 The Chromium OS Authors.
 .. sectionauthor:: sjg@chromium.org

tools/docker/Dockerfile

@@ -16,6 +16,7 @@ RUN echo deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-16 main | tee /etc/
 
 # Manually install the kernel.org "Crosstool" based toolchains for gcc-12.2.0
 RUN wget -O - https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/12.2.0/x86_64-gcc-12.2.0-nolibc-aarch64-linux.tar.xz | tar -C /opt -xJ
+RUN wget -O - https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/12.2.0/x86_64-gcc-12.2.0-nolibc-arc-linux.tar.xz | tar -C /opt -xJ
 RUN wget -O - https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/12.2.0/x86_64-gcc-12.2.0-nolibc-arm-linux-gnueabi.tar.xz | tar -C /opt -xJ
 RUN wget -O - https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/12.2.0/x86_64-gcc-12.2.0-nolibc-i386-linux.tar.xz | tar -C /opt -xJ
 RUN wget -O - https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/12.2.0/x86_64-gcc-12.2.0-nolibc-m68k-linux.tar.xz | tar -C /opt -xJ
@@ -29,7 +30,6 @@ RUN wget -O - https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_
 
 # Manually install other toolchains
 RUN wget -O - https://github.com/foss-xtensa/toolchain/releases/download/2020.07/x86_64-2020.07-xtensa-dc233c-elf.tar.gz | tar -C /opt -xz
-RUN wget -O - https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/download/arc-2021.03-release/arc_gnu_2021.03_prebuilt_uclibc_le_archs_linux_install.tar.gz | tar --no-same-owner -C /opt -xz
 
 # Update and install things from apt now
 RUN apt-get update && apt-get install -y \
@@ -277,7 +277,6 @@ RUN virtualenv -p /usr/bin/python3 /tmp/venv && \
 # Create the buildman config file
 RUN /bin/echo -e "[toolchain]\nroot = /usr" > ~/.buildman
 RUN /bin/echo -e "kernelorg = /opt/gcc-12.2.0-nolibc/*" >> ~/.buildman
-RUN /bin/echo -e "arc = /opt/arc_gnu_2021.03_prebuilt_uclibc_le_archs_linux_install" >> ~/.buildman
 RUN /bin/echo -e "\n[toolchain-prefix]\nxtensa = /opt/2020.07/xtensa-dc233c-elf/bin/xtensa-dc233c-elf-" >> ~/.buildman;
 RUN /bin/echo -e "\n[toolchain-alias]\nsh = sh2" >> ~/.buildman
 RUN /bin/echo -e "\nsandbox = x86_64" >> ~/.buildman