travis-ci: Add m68k M5208EVBE machine

Add m68k M5208EVBE machine configured to test U-Boot m68k support.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

bin/travis-ci/conf.M5208EVBE_qemu

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+# Copyright (c) 2023 Marek Vasut <marek.vasut+renesas@mailbox.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+# DEALINGS IN THE SOFTWARE.
+
+console_impl=qemu
+qemu_machine="mcf5208evb"
+qemu_binary="qemu-system-m68k"
+qemu_extra_args="-nographic -serial mon:stdio -net user,tftp=${UBOOT_TRAVIS_BUILD_DIR} -net nic,model=mcf-fec"
+qemu_kernel_args="-bios ${U_BOOT_BUILD_DIR}/u-boot.bin"
+reset_impl=none
+flash_impl=none

py/travis-ci/u_boot_boardenv_M5208EVBE_qemu.py

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+import os
+import travis_tftp
+
+env__net_uses_pci = False
+env__net_dhcp_server = True
+env__net_tftp_readable_file = travis_tftp.file2env('u-boot')