host1x virtualization: basic support

- Adds a new host1x pushbuffer queue
- Includes support for virtualized VIC

Bug 1509609

Change-Id: Ie9b604dc8d8e43166dedb13953c4edac813da18b
Signed-off-by: Peter Daifuku <pdaifuku@nvidia.com>
Reviewed-on: http://git-master/r/655506
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Arto Merilainen <amerilainen@nvidia.com>

include/linux/tegra_vgpu.h

@@ -24,7 +24,10 @@ enum {
 };
 
 enum {
-	TEGRA_VGPU_QUEUE_CMD = 2,
+	/* Needs to follow last entry in TEGRA_VHOST_QUEUE_* list,
+	 * in tegra_vhost.h
+	 */
+	TEGRA_VGPU_QUEUE_CMD = 3,
 	TEGRA_VGPU_QUEUE_INTR
 };