gpu: nvgpu: RPPG support

- Added rppg module to init GR/MS-RPPG.
  mscg is dependent on gr-rppg & without
  gr-rppg engage mscg does not engage.
- Update pg engines HAL to return supported
  pg engines & its sub features

JIRA DNVGPU-71

Change-Id: Ib0fd2d79b509f6f2f1dabae6e2b5aebcc80b5691
Signed-off-by: Mahantesh Kumbar <mkumbar@nvidia.com>
Reviewed-on: http://git-master/r/1247486
(cherry picked from commit 86e45fa62e6a6b295f73c0173f0117ae9f78a5e9)
Reviewed-on: http://git-master/r/1270762
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

drivers/gpu/nvgpu/lpwr/rppg.h

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+#ifndef _RPPG_H_
+#define _RPPG_H_
+
+u32 init_rppg(struct gk20a *g);
+#endif