mfd: wcd9335: add wcd irq support

WCD9335 supports two lines of irqs INTR1 and INTR2. Multiple interrupts
are muxed via these lines. INTR1 consists of all possible interrupt
sources like: Ear OCP, HPH OCP, MBHC, MAD, VBAT, and SVA. INTR2 is a
subset of first interrupt sources like MAD, VBAT, and SVA

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Vinod Koul <vkoul@kernel.org>