ARM: dts: OMAP3-N900: Add microphone bias voltages

ARM: dts: OMAP3-N900: Add microphone bias voltages

N900 audio recording needs that codec provides bias voltage for integrated
digital microphone and headset microphone depending which one is used.
Digital microphone uses 2 V bias and it comes from the codec A part. Codec
B part drives the headset microphone bias and that is set to 2.5 V.

Cc: [email protected] # v3.16+
Signed-off-by: Pavel Machek <[email protected]>
[Jarkko: Headset mic bias changed to 2 (2.5 V) as it was before commit
e2e8bfdf6157 ("ASoC: tlv320aic3x: Convert mic bias to a supply widget")]
Signed-off-by: Jarkko Nikula <[email protected]>
Signed-off-by: Tony Lindgren <[email protected]>