msm: kgsl: Handle attach PT error for secure PT

Add check to make sure attach PT is successful before proceeding
further for querying/setting domain attributes. Also, correct
error log for DOMAIN_ATTR_CONTEXT_BANK query failure.

Change-Id: I44bafaa6d4465dfd46b5c4bdb59c428b9a486bf2
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>