[media] mt2060: add param to split long i2c writes

Add configuration parameter to split long i2c writes as some I2C
adapters cannot write 10 bytes used as a one go.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>