UPSTREAM: pinctrl: rockchip: remove unnecessary locking

UPSTREAM: pinctrl: rockchip: remove unnecessary locking

regmap_update_bits does its own locking and everything else accessed
here is a local variable so there is no need to lock around it.

Signed-off-by: John Keeping <john@metanate.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
(cherry picked from commit f07bedc37f3cfb7b182e1337fe7c8acce71e3a25)

Change-Id: Id15c7ed10f32202c986c951ef328a84be5798af4
Signed-off-by: David Wu <david.wu@rock-chips.com>