ASoC: msm8916-wcd-analog: Add MIC BIAS Internal3

PM8916 has three TX inputs that each have an (optional) internal
RBIAS resistor. MIC BIAS Internal1/2 (for TX1/2) are already supported.
TX3 does not have its own MIC BIAS supply, instead it is also supplied
from MIC_BIAS1.

Now that we have simplified the MIC BIAS Internal* implementation
we can easily add support for it:

Add a MIC BIAS Internal3 supply that enables the internal RBIAS
resistor on TX3, and make sure to also enable the MIC_BIAS1 supply.

Tested-by: Nikita Travkin <[email protected]> # longcheer-l8150
Cc: Srinivas Kandagatla <[email protected]>
Signed-off-by: Stephan Gerhold <[email protected]>
Reviewed-by: Srinivas Kandagatla <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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