ASoC: wcd9xxx: Pass running RC oscillator clock rate to mbhc init

Pass the current running RC oscillator clock rate to mbhc init
so as to calibrate t_dce and t_sta correctly. If t_dce and t_sta
are not calibrated correctly, there is a possibility that DCE
registers are read before they reach steady state value, which would
result in not detecting button press.

Change-Id: Ia4f6c413783fad8db783ff69b85ef0bd05e455da
CRs-fixed: 483593
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>