ASoC: wm8731: Move regulator request into wm8731_init()

The supplies used by the wm8731 do not depend on the bus and there is no
need to do anything with the supplies prior to instantiating the regmap so
move the request into wm8731_init().

Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20220325153121.1598494-4-broonie@kernel.org


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