rockchip: add support for PINE64 ROCK64

rockchip: add support for PINE64 ROCK64

This add support for PINE64 ROCK64, rockchip rk3328 board.

Specifications:

 4 x ARM Cortex A53 cores @ 1.5 GHz
 ARM Mali 450 MP2 GPU
 LPDDR3 RAM (up to 4GB)
 Gigabit Ethernet
 Micro SD Slot
 eMMC module slot
 SPI Flash 128Mbit
 4K digital video out
 2x USB 2.0 Host
 1x USB 3.0 Host
 PI-2 bus
 PI-P5+ bus
 IR R/X port
 Real Time Clock (RTC) port
 Power Over Ethernet (POE) (when using optional HAT module)
 A/V jack
 Power, Reset and Recovery buttons
 3.5mm barrel power (5V 3A) port

To install write image to the sd using dd (dd if=*.img of=/*)

Signed-off-by: Antonio Flores <antflores627@gmail.com>