arm64: dts: qcom: msm8953-xiaomi-vince: correct wled ovp value

arm64: dts: qcom: msm8953-xiaomi-vince: correct wled ovp value

PMI8950 doesn't actually support setting an OVP threshold value of
29.6 V. The closest allowed value is 29.5 V. Set that instead.

Fixes: aa17e707e04a ("arm64: dts: qcom: msm8953: Add device tree for Xiaomi Redmi 5 Plus")
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Barnabás Czémán <barnabas.czeman@mainlining.org>
Link: https://lore.kernel.org/r/20260116-pmi8950-wled-v3-5-e6c93de84079@mainlining.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>