regulator: rename da903x to da903x-regulator

This module shares the same name as its parent PMIC driver, which
confuses tools like kmod. Rename the regulator driver to avoid
such problems.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Link: https://lore.kernel.org/r/20200624171010.845271-1-seth.forshee@canonical.com


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