regulator: fan53555: Improve vsel_mask computation
In preparation for introducing support for additional regulators which do not use the maximum number of voltage selectors available for a given mask, improve the mask computation formula by using fls(). Note fls() requires the bitops header, hence include it explicitly and drop bits.h which is already pulled by bitops.h. Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com> Link: https://lore.kernel.org/r/20230406194158.963352-7-cristian.ciocaltea@collabora.comSigned-off-by: Mark Brown <broonie@kernel.org>
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