swift.conf: Build an ext4 image

Build an ext4 image for swift to be used in its eMMC chip.

Tested: An ext4 image was built in addition to the current ubi ones.

Change-Id: Ifd546d9604309853ec4da06b8e34699ecc296a70
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
1 file changed