drivers: media: cfe: Set the CSI-2 link frequency correctly

Use the sensor provided link frequency to set the DPHY timing parameters
on stream_on. This replaces the hard-coded 999 MHz value currently being
used. As a fallback, revert to the original 999 Mhz link frequency.

As a drive-by, fix a 80-character line formatting error.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>