regulator: bd9571mwv: Fix regulator name printed on registration failure

If a regulator fails to register, the driver prints an error message
like:

    bd9571mwv-regulator bd9571mwv-regulator.6.auto: failed to register bd9571mwv-regulator regulator

However, the platform device's name is already printed as part of
dev_err(), and does not allow the user to distinguish among the various
regulators that are part of the PMIC.

Fix this by printing regulator_desc.name instead, to change the message
like:

    bd9571mwv-regulator bd9571mwv-regulator.6.auto: failed to register DVFS regulator

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Link: https://lore.kernel.org/r/20210312130242.3390038-3-geert+renesas@glider.be


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