[media] mceusb: set a default rx timeout

Its possible for the call to read rx timeout from the hardware to fail,
in which case we end up with a bogus rx timeout value. Set a default one
when filling in the rc struct, and we'll just overwrite it later w/the
value from hardware, but if that read fails, we've at least got a sane
rx timeout value to work with (1000ms is the default value I've seen
returned on most if not all mceusb hardware).

Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>