abuild: replace hardcoded values by their variables

Some coreboot-builds/ and makes made their way into
abuild. Stop them.

Change-Id: I5784e1fd623ada30e2fadcc74a7da3ee75c5ee96
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/5772
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
1 file changed