Use consistent SMCCC error code

Removed duplicate error code present for SMCCC and used
proper error code for "SMCCC_ARCH_WORKAROUND_2" call.

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I76fc7c88095f78a7e2c3d205838f8eaf3132ed5c
2 files changed