regulator: rn5t618: fix module aliases

[ Upstream commit 62a1923c ]

platform device aliases were missing, preventing
autoloading of module.

Fixes: 811b7006

 ("regulator: rn5t618: add driver for Ricoh RN5T618 regulators")
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Link: https://lore.kernel.org/r/20191211221600.29438-1-andreas@kemnade.info
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>