arm64: dts: qcom: qrb5165-rb5: correct LED panic indicator

arm64: dts: qcom: qrb5165-rb5: correct LED panic indicator

There is no "panic-indicator" default trigger but a property with that
name:

  qrb5165-rb5.dtb: leds: led-user4: Unevaluated properties are not allowed ('linux,default-trigger' was unexpected)

Fixes: b5cbd84e499a ("arm64: dts: qcom: qrb5165-rb5: Add onboard LED support")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20231111094623.12476-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>