arm64: dts: qcom: sc7280: Enable download mode register write

Enable download mode setting for sc7280 which can help collect
ramdump for this SoC.

Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240705143443.1491956-1-quic_mojha@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

Author: Mukesh Ojha

arch/arm64/boot/dts/qcom/sc7280.dtsi

@@ -711,6 +711,7 @@
 	firmware {
 		scm: scm {
 			compatible = "qcom,scm-sc7280", "qcom,scm";
+			qcom,dload-mode = <&tcsr_2 0x13000>;
 		};
 	};