video: bridge: add Toshiba TC358768 RGB to DSI bridge support

Add initial support for the Toshiba TC358768 RGB to DSI bridge.

The driver is based on the mainline Linux Toshiba TC358768
bridge driver and implements the same set of features.

Tested-by: Andreas Westman Dorcsak <hedmoo@yahoo.com> # ASUS TF700T
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>