regulator: dt-bindings: mps,mp5416: add MP5496 compatible

MP5496 is the updated version of MP5416 with the only difference being
that now all Buck regulators have the same 0.6-2.1875V range with a 12.5mV
step.

Since there is no way to differentiate them other than using compatibles,
add compatible for the MP5496.

Signed-off-by: Robert Marko <robimarko@gmail.com>
Link: https://lore.kernel.org/r/20220604145816.47576-1-robimarko@gmail.com


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