msm: kgsl: Finish up probe cleanups

Do the last bits needed to make the probes defer capable. Fix a few more
device_node reference counts and fix up the probe failure unwind paths.

Change-Id: Ic0dedbadd6f4c9b46a02e9b6ea0b145c81b50520
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>