regulator: devres: Standardise on function documentation headers

Line up descriptions, start description with a lower-case character and
omit old definitions such as quoting the old argument "consumer".

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20200708124832.3441649-4-lee.jones@linaro.org


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