include: env: phytec: Add common mmc boot for K3 SoMs

This environment include can be used to boot from a
MMC device for PHYTEC's K3-based SoMs.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
Reviewed-by: Wadim Egorov <w.egorov@phytec.de>
1 file changed