ARM: rockchip: add suspend and resume for RK3288

It's a basic version of suspend and resume for rockchip,
it only support RK3288 now.

Signed-off-by: Tony Xie <xxx@rock-chips.com>
Signed-off-by: Chris Zhong <zyw@rock-chips.com>
Tested-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
diff --git a/arch/arm/mach-rockchip/rockchip.c b/arch/arm/mach-rockchip/rockchip.c
index d226b71..2b68a1a 100644
--- a/arch/arm/mach-rockchip/rockchip.c
+++ b/arch/arm/mach-rockchip/rockchip.c
@@ -23,9 +23,11 @@
 #include <asm/mach/map.h>
 #include <asm/hardware/cache-l2x0.h>
 #include "core.h"
+#include "pm.h"
 
 static void __init rockchip_dt_init(void)
 {
+	rockchip_suspend_init();
 	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 	platform_device_register_simple("cpufreq-dt", 0, NULL, 0);
 }