gpu: nvgpu: vgpu: add basic t19x HALs

- Added t19x vgpu platform data
- Added basic vgpu HAL for gv11b.
- Added subctx header HAL.

Jira VFND-3796

Change-Id: I2b99364801b41d042b53e057f1a30e1194f354c3
Signed-off-by: Richard Zhao <rizhao@nvidia.com>
Reviewed-on: https://git-master/r/1474729
GVS: Gerrit_Virtual_Submit
Reviewed-by: Aingara Paramakuru <aparamakuru@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

include/linux/tegra_vgpu_t19x.h

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2017, 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 __TEGRA_VGPU_T19X_H
+#define __TEGRA_VGPU_T19X_H
+
+#define TEGRA_VGPU_CMD_ALLOC_CTX_HEADER		100
+#define TEGRA_VGPU_CMD_FREE_CTX_HEADER		101
+
+struct tegra_vgpu_alloc_ctx_header_params {
+	u64 ch_handle;
+	u64 ctx_header_va;
+};
+
+struct tegra_vgpu_free_ctx_header_params {
+	u64 ch_handle;
+};
+
+union tegra_vgpu_t19x_params {
+	struct tegra_vgpu_alloc_ctx_header_params alloc_ctx_header;
+	struct tegra_vgpu_free_ctx_header_params free_ctx_header;
+};
+
+#endif