regulator: tps80031: Trivial cleanups

This patch includes below cleanups:

- Fix typo in comment
- Fix showing wrong register in dev_err
- Remove unnecessary rinfo variable
- Add TPS80032 to MODULE_DESCRIPTION

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>