rockchip: Add cpu-info

Add cpu information for rockchip soc.

This would help to print the SoC family number, with
associated temparature, clock and reason for reset etc.

Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/arch/arm/mach-rockchip/Makefile b/arch/arm/mach-rockchip/Makefile
index a728acd..5b38526 100644
--- a/arch/arm/mach-rockchip/Makefile
+++ b/arch/arm/mach-rockchip/Makefile
@@ -22,6 +22,7 @@
 # we can have the preprocessor correctly recognise both 0x0 and 0
 # meaning "turn it off".
 obj-y += boot_mode.o
+obj-$(CONFIG_DISPLAY_CPUINFO) += cpu-info.o
 obj-$(CONFIG_ROCKCHIP_COMMON_BOARD) += board.o
 obj-$(CONFIG_MISC_INIT_R) += misc.o
 endif