power: add rockchip_pm.c for devices low power control

during system suspend in charge animation, we may need add
power manage control for some devices low power. Since U-Boot
don't provide standard

power: add rockchip_pm.c for devices low power control

during system suspend in charge animation, we may need add
power manage control for some devices low power. Since U-Boot
don't provide standard suspend/resume callback for device. We
have to add rockchip_pm.c to write hard code to achieve this
for different platforms or boards.

Change-Id: I01f67c7c57cbcaae48d3def65eea8cab499af93b
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>

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