For linear regulators, the .n_voltages is (max_uv - min_uv) / uv_step + 1.

Fixes: 0fbeae70 ("regulator: add SCMI driver")
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Reviewed-by: NCristian Marussi <cristian.marussi@arm.com>
Link: https://lore.kernel.org/r/20210521073020.1944981-1-axel.lin@ingics.comSigned-off-by: NMark Brown <broonie@kernel.org>