v4l2: Add mapping for big-endian RGB565 (BGR16 in gst)
Mauro Carvalho Chehab (maintainer of linux-media) ask me why vim2m test driver wasn't detected by GStreamer. So I looked it up, and found a first issue, might only be the tip of the issue, but has to happen to get this test driver running. This driver only support one capture format, BGR16, which isn't mapped in the v4l2 glue.