Modify GMEM Save procedure as per A3XX GPU spec to support multiple GPU revisions. It also fixes A3XX GPU hang caused by GMEM save procedure. CRs-Fixed: 375034 Change-Id: I24a4d6c4fd8304b3f41a167c116a75f2e3680158 Signed-off-by: Rajeev Kulkarni <krajeev@codeaurora.org>