regmap_update_bits could fail and deserves a check.

The patch adds the checks and if it fails, returns its error
code upstream.
Signed-off-by: NKangjie Lu <kjlu@umn.edu>
Reviewed-by: NMukesh Ojha <mojha@codeaurora.org>
Signed-off-by: NStefan Schmidt <stefan@datenfreihafen.org>