MSCC: add device tree for Serval2 board

Add device tree based on evaluation board pcb112.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index c419bee..3fa5d3e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -522,6 +522,7 @@
 F:	arch/mips/dts/mscc*
 F:	arch/mips/dts/ocelot*
 F:	arch/mips/dts/jr2*
+F:	arch/mips/dts/serval*
 F:	board/mscc/
 F:	configs/mscc*
 F:	drivers/gpio/mscc_sgpio.c