regulator: bd9576: Fix print

The print in probe is done using pr_info. Correct print call would be
dev_dbg because:
 - Severity should really be dbg
 - The dev pointer is given as first argument

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Link: https://lore.kernel.org/r/c4f55add237455555df0597c72052022f7a669f6.1601885841.git.matti.vaittinen@fi.rohmeurope.com
Signed-off-by: Mark Brown <broonie@kernel.org>