regulator: max5970: Rename driver and remove wildcard

The previous version of this driver included wildcards in file names and
descriptions. This patch renames the driver to only support MAX5970 and
MAX5978, which are the only chips that the driver actually supports.

Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
Link: https://lore.kernel.org/r/20230801102453.1798292-1-Naresh.Solanki@9elements.com


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