mfd: wcd9xxx: Continue to probe codec without interrupt

Don't treat as an error when no interrupt is configured.
Interrupts are not mandatory for codec driver and hardware.

Change-Id: Ic54f2cdf6f4916db89700b745d82e199bdccf48c
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
1 file changed