ASoC: meson: t9015: Add missing AVDD-supply property

Fixes the schema check warning "audio-controller@32000: 'AVDD-supply'
do not match any of the regexes: 'pinctrl-[0-9]+'"

Fixes: 5c36abcd ("ASoC: meson: add t9015 internal codec binding documentation")
Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Alexander Stein <alexander.stein@mailbox.org>
Link: https://lore.kernel.org/r/20211026182754.900688-1-alexander.stein@mailbox.org


Signed-off-by: Mark Brown <broonie@kernel.org>