weston: remoting backend requires GStreamer base plugins

The remoting backend of weston requires the GStreamer base plugins, so
add them to the PACAKGECONFIG depends list.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 0b459946)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>