clk: renesas: add R906G032 driver

Clock driver for the Renesas RZ/N1 SoC family. This is based on
Linux kernel 6.2.y drivers/clk/renesas/r9a06g032-clocks.c as found in
commit 02693e11611e ("clk: renesas: r9a06g032: Repair grave increment error"),
with the following additional patch series applied:
https://lore.kernel.org/linux-renesas-soc/20230301215520.828455-1-ralph.siemsen@linaro.org/

Notable difference: this version avoids allocating a 'struct clk'
for each clock source, as this is problematic before relocation.
Instead, it uses the same approach as existing Renesas R-Car Gen2/3
clock drivers, using a temporary structure filled on-the-fly.

Signed-off-by: Ralph Siemsen <ralph.siemsen@linaro.org>
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

drivers/clk/renesas/Kconfig

@@ -150,3 +150,9 @@ config CLK_R8A779G0
 	depends on CLK_RCAR_GEN3
 	help
 	  Enable this to support the clocks on Renesas R8A779G0 SoC.
+
+config CLK_R9A06G032
+	bool "Renesas R9A06G032 clock driver"
+	depends on CLK_RENESAS
+	help
+	  Enable this to support the clocks on Renesas R9A06G032 SoC.

drivers/clk/renesas/Makefile

@@ -22,3 +22,4 @@ obj-$(CONFIG_CLK_R8A77995) += r8a77995-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A779A0) += r8a779a0-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A779F0) += r8a779f0-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A779G0) += r8a779g0-cpg-mssr.o
+obj-$(CONFIG_CLK_R9A06G032) += r9a06g032-clocks.o