Avoid a false recursive locking warning from lockdep by adding a lock
class for the arizona IRQ chip.
Signed-off-by: NCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NLee Jones <lee.jones@linaro.org>