regulator: bd71815: Get rid of struct bd71815_pmic

regulator: bd71815: Get rid of struct bd71815_pmic

The content of bd71815_regulators is never changed, no need to duplicate
it, thus remove descs[BD71815_REGULATOR_CNT].
The *regmap, *dev and *rdev[BD71815_REGULATOR_CNT] are not really needed.
The *gps is unused.

Thus the struct bd71815_pmic can be removed.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Reviewed-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Link: https://lore.kernel.org/r/20210607143002.1600017-1-axel.lin@ingics.com
Signed-off-by: Mark Brown <broonie@kernel.org>