MAINTAINERS: add new soc drivers to Microchip RISC-V entry

Add the two new syscon drivers to the RISC-V entry for Microchip
platforms.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

Author: ConchuOD

MAINTAINERS

@@ -22105,6 +22105,8 @@ F:	drivers/pci/controller/plda/pcie-microchip-host.c
 F:	drivers/pwm/pwm-microchip-core.c
 F:	drivers/reset/reset-mpfs.c
 F:	drivers/rtc/rtc-mpfs.c
+F:	drivers/soc/microchip/mpfs-control-scb.c
+F:	drivers/soc/microchip/mpfs-mss-top-sysreg.c
 F:	drivers/soc/microchip/mpfs-sys-controller.c
 F:	drivers/spi/spi-microchip-core-qspi.c
 F:	drivers/spi/spi-microchip-core.c