[media] msi3101: add support for stream format "252" I+Q per frame

That one seems to have 14-bit ADC resolution, wow!
It is now used when sampling rate is below 6 Msps.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>