gstreamer: Fix the compilation issue in meta multimedia image

When we tried to build the meta-multimedia-image, we faced the
compilation issue with faad component.

Since faad component has commercial license, we could not able
to build with multimedia image. So we have modified the faad
component to be included when commercial licenese is supported.

Signed-off-by: Madhavan Krishnan <madhavan.krishnan@linaro.org>

recipes-multimedia/gstreamer/gstreamer1.0-plugins-bad_%.bbappend

@@ -1 +1,2 @@
-PACKAGECONFIG_append_rpi = " hls libmms faad"
+PACKAGECONFIG_append_rpi = " hls libmms \
+                   ${@bb.utils.contains('LICENSE_FLAGS_WHITELIST', 'commercial', 'faad', '', d)}"