regulator: qcom-rpmh: Fix regulators for PM8550

The PM8550 uses only NLDOs 515 and the LDO 6 through 8 are low voltage
type, so fix accordingly.

Fixes: e6e3776d ("regulator: qcom-rpmh: Add support for PM8550 regulators")
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20230605115607.921308-1-abel.vesa@linaro.org


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