SPM: Remove deprivileged FLIH context in isolation level 1

In isolation level 1, all partitions run in privileged
mode, so deprivileged FLIH is not needed.

Signed-off-by: Sherry Zhang <sherry.zhang2@arm.com>
Change-Id: Ibe06bc5fadbfc259ffaf9a783357575140a558d8
3 files changed