asoc: wcd937x: Add support to clear ack registers

WCD937x codec requires clear registers to be written '1' and
'0' for clearing interrupts. Enable clear_ack flag in regmap
irq chip structure for wcd937x.

Change-Id: I0a2e4fc85fe6dca75885b5300840669afeabc80c
Signed-off-by: Vangala, Amarnath <avangala@codeaurora.org>