fix(cm): save guarded control stack registers

This patch fixes a typo which led to incorrect context save
operations for two FEAT_GCS registers.

Change-Id: I3d3202a6721714bbc8f84c2d775d1b28afffa5df
Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
1 file changed