ASoC: wcd9xxx: Correct handling of RC Oscillator

If only RC oscillator is enabled and disabled with out
enabling mclk,RC oscillator is never getting disabled
which is effecting recording through handset.So disable
RC oscillator completely by writting appropriate registers.

CRs-Fixed: 572295
Change-Id: I9df292ec8c34ec6a2f514e492adff8eb751ac7f3
Signed-off-by: Yeleswarapu, Nagaradhesh <nagaradh@codeaurora.org>