arm64: dts: qcom: sm8750: Change labels to lower-case

DTS coding style expects labels to be lowercase.  No functional impact.
Verified with comparing decompiled DTB (dtx_diff and fdtdump+diff).

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250219090751.124267-1-krzysztof.kozlowski@linaro.org


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