Can build SD/xspi bootable images, with different SERDES and DDR speed
RCW parameters.
The boot loader can be u-boot or uefi.

Based on LSDK-19.06 releases with patches to support SolidRun LX2160A
COM express type 7 modules; and HoneyComb as carrier board.
Signed-off-by: Rabeeh Khoury <rabeeh@solid-run.com>