configs/imx6-sabresd_qt5: enable gstreamer videotestsrc plugin

The videotestsrc Gstreamer plugin is very useful for testing.

Enable it by default.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/imx6-sabresd_qt5_defconfig

@@ -93,6 +93,7 @@ BR2_PACKAGE_GST1_PLUGINS_GOOD_PLUGIN_V4L2_PROBE=y
 BR2_PACKAGE_GST1_PLUGINS_BAD=y
 BR2_PACKAGE_GST1_PLUGINS_BAD_PLUGIN_VIDEOPARSERS=y
 BR2_PACKAGE_GST1_PLUGINS_BAD_PLUGIN_KMS=y
+BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_VIDEOTESTSRC=y
 
 # For automatic kernel module loading
 BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV=y