arm: mmp: add initial support for PXA1908 SoC

Add initial support for Marvell PXA1908. The SoC has 4 Cortex-A53 cores,
a GC7000UL GPU and a variety of peripheral controllers.

Signed-off-by: Duje Mihanović <duje.mihanovic@skole.hr>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index cb87a68..7334e79 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -69,6 +69,7 @@
 machine-$(CONFIG_ARCH_LPC32XX)		+= lpc32xx
 machine-$(CONFIG_ARCH_MEDIATEK)		+= mediatek
 machine-$(CONFIG_ARCH_MESON)		+= meson
+machine-$(CONFIG_ARCH_MMP)		+= mmp
 machine-$(CONFIG_ARCH_MVEBU)		+= mvebu
 machine-$(CONFIG_ARCH_NEXELL)		+= nexell
 machine-$(CONFIG_ARCH_NPCM)             += npcm