binaryPI boards: Bulk remove BINARYPI_LEGACY_WRAPPER remains
These boards currently have no build-testing, so they degrade
fast. Apply some of the build-tested changes we know to be
good from pcengines/apu2 to get them a bit closer to using
POSTCAR_STAGE=y.
Change-Id: Ibc9a15ed5e91c6dd857f2dd02e37d0979dd6ae90
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37373
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com>