media: i2c: imx219: fix binning and rate_factor for 480p and 1232p

At a high FPS with RAW10, there is frame corruption for 480p because the
rate_factor of 2 is used with the normal 2x2 bining [1]. This commit
ties the rate_factor to the selected binning mode. For the 480p mode,
analog 2x2 binning mode with a rate_factor of 2 is always used. For the
1232p mode the normal 2x2 binning mode is used for RAW10 while analog
2x2 binning mode is used for RAW8.

[1] raspberrypi#5493

Signed-off-by: Vinay Varma <varmavinaym@gmail.com>
Reworked due to upstream changes
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>