Fix restoration of PAuth context
Fix restoration of PAuth context

Replace call to pauth_context_save() with pauth_context_restore()
in case of unknown SMC call.

Change-Id: Ib863d979faa7831052b33e8ac73913e2f661f9a0
Signed-off-by: Alexei Fedorov <c822f9d283009ea22aff7123d9d948b6c6849e25@arm.com>

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware