regulator: pickable ranges: don't always cache vsel

regulator: pickable ranges: don't always cache vsel

Some PMICs treat the vsel_reg same as apply-bit. Eg, when voltage range
is changed, the new voltage setting is not taking effect until the vsel
register is written.

Add a flag 'range_applied_by_vsel' to the regulator desc to indicate this
behaviour and to force the vsel value to be written to hardware if range
was changed, even if the old selector was same as the new one.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://msgid.link/r/ZktCpcGZdgHWuN_L@fedora
Signed-off-by: Mark Brown <broonie@kernel.org>