rockchip: px30: add evb_px30 board support

PX30 is a rockchip evb for px30, including all harware interface
from px30.

Change-Id: I5bac5a7ebf23b5c51b3a01f51fe0404db0a1b5fc
Signed-off-by: Kever Yang

rockchip: px30: add evb_px30 board support

PX30 is a rockchip evb for px30, including all harware interface
from px30.

Change-Id: I5bac5a7ebf23b5c51b3a01f51fe0404db0a1b5fc
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>

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