cx231xx: Fix I2C on Internal Master 3 Bus

[ Upstream commit 6c5da8031a3abfad259190d35f83d89568b72ee2 ]

Internal Master 3 Bus can send and receive only 4 bytes per time.

Signed-off-by: Oleh Kravchenko <oleg@kaa.org.ua>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>