regulator: qcom,rpmh: Add compatible for PM6350

Add compatible string for pm6350 used in sm6350 boards.

Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Link: https://lore.kernel.org/r/20211007212444.328034-3-luca@z3ntu.xyz


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