ASoC: sun8i-codec: Convert to SOC_MIXER_ARRAY

SOC_MIXER_ARRAY is a simplified function of SND_SOC_DAPM_MIXER
which handles automatically the ARRAY_SIZE of controls.

Update the driver to use SOC_MIXER_ARRAY.

Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Mark Brown <broonie@kernel.org>