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All firmware banks should be part of the same non-volatile storage
as per PSA FWU specification, hence avoid checking for any alternate
boot source when PSA FWU is enabled.

Change-Id: I5b016e59e87f1cbfc73f4cd29fce6017c24f88b3
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>