ASoC: wcd9xxx: Change Supply Switch Control to automatic

On Tapan codec, supply voltage to the scaling_mux_1
register has to be set to automatic to be able to measure
the mic voltage correctly when mic bias is pulled high above
2.2 Volts, so leave the register TX_SUP_SWITCH_CTRL_1 to
default value of 0.

Change-Id: I2c55c1b95f8fe769ea6c330963255b5f45270a2f
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>