CONFIG_ROCKCHIP_PERFORMANCE_LEVEL=0 for low performance, low power consumption
CONFIG_ROCKCHIP_PERFORMANCE_LEVEL=1 for normal performance
CONFIG_ROCKCHIP_PERFORMANCE_LEVEL=2 for high performance, high power consumption
Change-Id: I7a88f1a2e43513f647a860b427d8344e34165fa6
Signed-off-by: Liang Chen <cl@rock-chips.com>