media: i2c: imx214: Convert to CCI register access helpers

Use the new common CCI register access helpers to replace the private
register access helpers in the imx214 driver. This simplifies the driver
by reducing the amount of code.

Acked-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: André Apitzsch <git@apitzsch.eu>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>