ASoC: tlv320aic31xx: Make the register values human readable

The datasheet uses decimal numbers for the register addresses, convert the
register values from hexadecimal to decimal and introduce macro for the
register definitions. This way it is easier to look up registers in the
documentation.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>