regulator: max14577: Reduce duplication of regulator_desc initializers

Replace duplicated initializers in arrays of struct 'regulator_desc'
with macro. Generated object is the same but each type of regulator is
described only once.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>