gstreamer: Set DEPENDS dynamically for plugins-ugly and plugins-bad

gstreamer: Set DEPENDS dynamically for plugins-ugly and plugins-bad

Only add plugins-ugly or plugins-bad to the DEPENDS if they are
added to the COMMERCIAL_AUDIO_PLUGINS or COMMERCIAL_VIDEO_PLUGINS.

Signed-off-by: Drew Moseley <drew_moseley@mentor.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>