apalis-imx8: implement pcb version and soc variant handling

Implement PCB version and SoC variant handling which automatically loads
the correct device tree for the Linux kernel.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Andrejs Cainikovs <andrejs.cainikovs@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>
3 files changed