fix(psci): mask MBZ bits in PSCI target_cpu arguments

The PSCI specification defines the target_cpu values almost the same as
the MPIDR_EL1 register value, however it only contains the Aff0-3 fields
and the rest is declared as MBZ. Mask the MBZ bits to follow the PSCI
specification.

Change-Id: I4196b5039aa774b357cb6932d3c2c24060f1f228
Signed-off-by: Imre Kis <imre.kis@arm.com>
3 files changed