Add the fw_config entries for the newly added boot device fields.
These are added as separate fields since a board may have more
than one selected.
BUG=b:173129299
TEST=abuild google/volteer
Change-Id: I2af9ffcf0b90d4f4b7f2f31613ee110d8f350454
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48160
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
89bbe146cb