regulator: mt6397: Remove modeset_shift from struct mt6397_regulator_info

The shift setting can be calculated via the corresponding mask field,
so remove modeset_shift.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Link: https://lore.kernel.org/r/20210629130503.2183574-3-axel.lin@ingics.com


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