UPSTREAM: pinctrl: rockchip: avoid hardirq-unsafe functions in irq_chip

UPSTREAM: pinctrl: rockchip: avoid hardirq-unsafe functions in irq_chip

With real-time preemption, regmap functions cannot be used in the
implementation of irq_chip since they use spinlocks which may sleep.

Move the setting of the mux for IRQs to an irq_bus_sync_unlock handler
where we are allowed to sleep.

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>
Signed-off-by: David Wu <david.wu@rock-chips.com>
(cherry picked from commit 88bb94216f59e10802aaf78c858a4146085faf18)

Signed-off-by: David Wu <david.wu@rock-chips.com>
Change-Id: I94ae59be60c34022fdfdf67cd5b3059d852a5969