Fix typo in vdd-l5-l16 supply of qcom,pm8550-rpmh-regulators.

Fixes: 71342fb9 ("arm64: dts: qcom: Add base SM8550 MTP dts")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230127121843.349738-1-krzysztof.kozlowski@linaro.org