Changes such that DAC Mux will only affect whether the headphone
output gets connected to the DAC or Line in.
The previous implementation of the DAC Mux allowed the dapm power
level of the sgtl5000 to be affected whether audio was playing or
not. It also controlled the an internal osc which had no effect
since it didn't affect whether mclk was turned on.
Signed-off-by: Alan Tull <r80115@freescale.com>
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