rockchip: Add core SoC start-up code

Add code for starting up U-Boot SPL and U-Boot proper. This is generic and
makes use of devices provided by the board- or SoC-specific code.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index e84d6d3..1eca815 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -55,6 +55,7 @@
 # TODO: rename CONFIG_ORION5X -> CONFIG_ARCH_ORION5X
 machine-$(CONFIG_ORION5X)		+= orion5x
 machine-$(CONFIG_ARCH_SOCFPGA)		+= socfpga
+machine-$(CONFIG_ARCH_ROCKCHIP)		+= rockchip
 machine-$(CONFIG_TEGRA)			+= tegra
 machine-$(CONFIG_ARCH_UNIPHIER)		+= uniphier
 machine-$(CONFIG_ARCH_VERSATILE)	+= versatile