regulator: mp5416: Fix output discharge enable bit for LDOs

The .active_discharge_on/.active_discharge_mask settings does not match
the datasheet, fix it.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Link: https://lore.kernel.org/r/20200212150223.20042-1-axel.lin@ingics.com


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