media: marvell-ccic: add support for runtime PM

On MMP3, the camera block lives on na separate power island. We want to
turn it off if the CCIC is not in use to conserve power.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>

--
Changes since v1:
(all at suggestions from Sakari Ailus)
- s/on na separate/on a separate/ in commit message
- Move clock management into PM callbacks
2 files changed