avfvideosrc: Fix missing GLMemory support.
GLMemory support is missing when doing desktop capture, which is unexpected when inspecting the plugin.
This adds caps for GLMemory for UYVY for screen capture (which is already in place for video capture).
GLMemory support is missing when doing desktop capture, which is unexpected when inspecting the plugin.
This adds caps for GLMemory for UYVY for screen capture (which is already in place for video capture).