arm64: dts: qcom: msm8992-libra: drop unused regulators labels

DTS coding style expects labels to be lowercase, but the labels are not
used, so just drop them.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20241022-dts-qcom-label-v3-3-0505bc7d2c56@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>