mk_mmc.sh: u-boot, add option for u-boot fdt variable name

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
mk_mmc.sh: make sure this is disabled in serial mode

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
hwpack: wandboards use uboot_fdt_auto_detection

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
mk_mmc.sh: much simplier kms overide

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
hwpack: use drm override

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
hwpack: wandboard use v3.15.x

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>