rockchip: rk3568: Add EmbedFire Lubancat 2 support

rockchip: rk3568: Add EmbedFire Lubancat 2 support

LubanCat2 is a rk3568 based SBC from EmbedFire.

Specification:
- Rockchip rk3568
- LPDDR4/4X 1/2/4/8 GB
- TF scard slot
- eMMC 8/32/64/128 GB
- Gigabit ethernet x 2
- HDMI out
- USB 2.0 Host x 1
- USB 2.0 Type-C OTG x 1
- USB 3.0 Host x 1
- Mini PCIE interface for WIFI/BT module
- M.2 key for 2280 NVME
- 40 pin header

The dts file is sync from linux mainline.

Signed-off-by: Andy Yan <andyshrk@163.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>