feat(fwu): initialize FWU driver in BL2

Initialized FWU driver module in BL2 component under
build flag PSA_FWU_SUPPORT.

Change-Id: I08b191599835925c355981d695667828561b9a21
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
3 files changed