ANDROID: GKI: regmap: irq: Add support to clear ack registers

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

Change-Id: I399592fc0ee7f3a01a32267684a9be340076ffb1
Signed-off-by: Ramprasad Katkam <katkam@codeaurora.org>
Bug: 153500481
[saravanak Minor edit to commit text]
(cherry picked from commit 25401ed9)
Signed-off-by: Saravana Kannan <saravanak@google.com>