regmap: irq: Add support to clear ack registers

WCD937x codec requires clear registers to be written '1' and
'0' for clearing interrupts. Add this support in regmap irq
inorder to clear ack registers.

Change-Id: I399592fc0ee7f3a01a32267684a9be340076ffb1
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>