drm/adreno: fix issue during gpu driver recovery

DRM Adreno driver triggers recovery when there is fence error and
it dumps registers during recovery. Some registers only exist
in the previous hardware versions. Accessing them causes GPU hang.
And firmware should be loaded during GPU init but not in recovery.

Change-Id: I38543417fe611ce92ded1042374382aa1c1dd6a9
Signed-off-by: Kasin Li <donglil@codeaurora.org>
Signed-off-by: Jin Li <jinl@codeaurora.org>