[media] [trivial] ov6650: Fix typo

Correct spelling "unspported" to "unsupported" in
drivers/media/video/ov6650.c

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>