rockchip: px30: add new soc support

The Rockchip PX30 is a ARM-based SoC with a quad-core Cortex-A35
including NEON and GPU, Mali-400 graphics, several DDR3 options
and video codec support. Peripher

rockchip: px30: add new soc support

The Rockchip PX30 is a ARM-based SoC with a quad-core Cortex-A35
including NEON and GPU, Mali-400 graphics, several DDR3 options
and video codec support. Peripherals include Gigabit Ethernet,
USB2 host and OTG, SDIO, I2S, UART, SPI, I2C and PWMs.

Change-Id: I0c3c58aa654d42291ae902593285bc974cda19d5
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>

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