The SoC Git was moved from arm/arm-soc.git to soc/soc.git.  Correct the
ARM Sub-architectures entry.
Signed-off-by: NKrzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20201201211516.24921-1-krzk@kernel.org'
Signed-off-by: NArnd Bergmann <arnd@arndb.de>