board: sl28: enable EFI UpdateCapsule support

Enable support for update over EFI UpdateCapsule mechanism. This board
doesn't support setting EFI variables after ExitBootservices().
Therefore, we are also enabling EFI_IGNORE_OSINDICATIONS.

Signed-off-by: Michael Walle <michael@walle.cc>
[Rebased]
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
2 files changed