ASoC: wm8960: correct gain value for input PGA and add microphone PGA
ASoC: wm8960: correct gain value for input PGA and add microphone PGA

The input PGAs have a gain range from -17.25dB to +30dB in 0.75dB steps.

The boost stage can provide additional gain. For line inputs, -12dB to
+6dB gain is available on the boost mixer. For micphone inputs, it can
provide up to +29dB additional gain from the microphone PGA.

Signed-off-by: Zidan Wang <3fcb6f8df82b54c7d117cf77f8dc10b524cd22a6@freescale.com>
Acked-by: Charles Keepax <8e4aa0015eb43ed5ca66aaca3fb498609e1e427c@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <b51b9a92386687a9ac927cebfa0f978adeb8cea5@kernel.org>

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