RK安卓7.0系统设置分辨率

以下为将720P分辨率调整至1080P的示例：

diff --git a/device/rockchip/rk322x/rk322x_box/system.prop b/device/rockchip/rk322x/rk322x_box/system.prop

index 00395cd..9f4c2a2 100755

--- a/device/rockchip/rk322x/rk322x_box/system.prop

+++ b/device/rockchip/rk322x/rk322x_box/system.prop