ASoC: wcd: enable mbhc interrupts after SSR

After ssr mbhc interrupts need to be enabled for mbhc
to work. If mbhc_init is not called, there are no
interrupts enabled. Call the api so that mbhc is
initialized properly.

Change-Id: I64ba4b8de50da2b527e20c90f99c79c49fabfed3
Signed-off-by: Simmi Pateriya <simmip@codeaurora.org>