regulator: mt6315: Don't ignore devm_regulator_register failure

Also use dev_err instead of dev_notice for messages in error conditions.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Link: https://lore.kernel.org/r/20210530020543.418634-1-axel.lin@ingics.com


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