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/mach-mmp/Makefile b/arch/arm/mach-mmp/Makefile
new file mode 100644
index 0000000..99beaed
--- /dev/null
+++ b/arch/arm/mach-mmp/Makefile
@@ -0,0 +1 @@
+obj-y += board.o mmu.o