ASoC: wcd9335: update default VBat Bias current

Update default value for VBat Bias current for Front-end.
The increase in current value is needed to increase
robustness of VBat ADC output when the feature is used
at low temparature.

Change-Id: Ic924fa59ce867f9b32c17564f8f55406c6c467ea
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>