MAINTAINERS: Introduce HPE GXP Architecture

Create a section in MAINTAINERS for the GXP HPE architecture

Signed-off-by: Nick Hawkins <nick.hawkins@hpe.com>

MAINTAINERS

@@ -279,6 +279,19 @@ F:	arch/arm/cpu/armv8/hisilicon
 F:	arch/arm/include/asm/arch-hi6220/
 F:	arch/arm/include/asm/arch-hi3660/
 
+ARM HPE GXP ARCHITECTURE
+M:	Jean-Marie Verdun <verdun@hpe.com>
+M:	Nick Hawkins <nick.hawkins@hpe.com>
+S:	Maintained
+F:	arch/arm/dts/hpe-bmc*
+F:	arch/arm/dts/hpe-gxp*
+F:	arch/arm/mach-hpe/
+F:	board/hpe/
+F:	configs/gxp_defconfig
+F:	doc/device-tree-bindings/spi/hpe,gxp-spi.yaml
+F:	drivers/timer/gxp-timer.c
+F:	drivers/spi/gxp_spi.c
+
 ARM IPQ40XX
 M:	Robert Marko <robert.marko@sartura.hr>
 M:	Luka Kovacic <luka.kovacic@sartura.hr>