Execute shader on wakeup from power collapse

After wakeup from power-collapse, a shader execution is needed
to reset the GPU to a known and stable state on certain targets.
This change implements the required shader execution only
on initialization and on recovery from power-collapse on A3xx
GPU targets.

CRs-fixed: 526544

Change-Id: Ibd33578ecbb94df5ff276d1e460d94235a82dc43
Signed-off-by: Richard Ruigrok <rruigrok@codeaurora.org>
Signed-off-by: Ananta Kishore K <akollipa@codeaurora.org>