MAINTAINERS: add entry for polarfire soc mailbox

Add Lewis Hanly as a maintainer for the Microchip SoC
directory and the system services mailbox driver

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

MAINTAINERS

@@ -15706,6 +15706,14 @@ F:	arch/riscv/
 N:	riscv
 K:	riscv
 
+RISC-V/MICROCHIP POLARFIRE SOC SUPPORT
+M:	Lewis Hanly <lewis.hanly@microchip.com>
+L:	linux-riscv@lists.infradead.org
+S:	Supported
+F:	drivers/mailbox/mailbox-mpfs.c
+F:	drivers/soc/microchip/
+F:	include/soc/microchip/mpfs.h
+
 RNBD BLOCK DRIVERS
 M:	Md. Haris Iqbal <haris.iqbal@ionos.com>
 M:	Jack Wang <jinpu.wang@ionos.com>