MAINTAINERS: add drivers/soc/amlogic/ to amlogic list

While sending a patch for drivers/soc/amlogic/Kconfig, I saw that
getmaintainer.pl give nobody for it.  This patchs adds
drivers/soc/amlogic/ to amlogic maintainers.
Signed-off-by: NCorentin Labbe <clabbe@baylibre.com>
Signed-off-by: NKevin Hilman <khilman@baylibre.com>

MAINTAINERS

@@ -1306,6 +1306,7 @@ F:	arch/arm/boot/dts/meson*
 F:	arch/arm64/boot/dts/amlogic/
 F:	drivers/pinctrl/meson/
 F:	drivers/mmc/host/meson*
+F:	drivers/soc/amlogic/
 N:	meson
 
 ARM/Annapurna Labs ALPINE ARCHITECTURE