Add initial support for RK3399 based rockpi-4 targets (model A, B, C)
with below features:
- Custom U-Boot 2020.07-rc4
https://github.com/amarula/u-boot-amarula.git
branch rock-pi
- Linux 5.4.46
- GPT partition layout is being used
- Default packages from buildroot
Signed-off-by: Suniel Mahesh <sunil@amarulasolutions.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
