MAINTAINERS: correct SoC Git address (formerly: arm-soc)

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

MAINTAINERS

@@ -1489,7 +1489,7 @@ F:	drivers/iommu/io-pgtable-arm*
 ARM SUB-ARCHITECTURES
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git
 F:	arch/arm/mach-*/
 F:	arch/arm/plat-*/