[media] vivid: add support for SMPTE 2084 transfer function

Support the new SMPTE 2084 transfer function in the vivid test driver.
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/vivid/vivid-ctrls.c

@@ -728,6 +728,7 @@ static const char * const vivid_ctrl_xfer_func_strings[] = {
 	"SMPTE 240M",
 	"None",
 	"DCI-P3",
+	"SMPTE 2084",
 	NULL,
 };