drm/vmwgfx: Update device includes for DX device functionality

Add DX includes and move all device includes to a separate directory.

Co-authored with Thomas Hellstrom, Charmaine Lee and above all,
the VMware device team.

Signed-off-by: Sinclair Yeh <syeh@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Charmaine Lee <charmainel@vmware.com>
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c
index 5667c13..04fa852 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c
@@ -1139,7 +1139,7 @@
 		 * actually call into the already enabled manager, when
 		 * binding the MOB.
 		 */
-		if (!(dev_priv->capabilities & SVGA_CAP_CMD_BUFFERS_3))
+		if (!(dev_priv->capabilities & SVGA_CAP_DX))
 			return -ENOMEM;
 
 		ret = ttm_bo_create(&dev_priv->bdev, size, ttm_bo_type_device,