arm64: dts: qcom: sdm845: Rename gic-its node to msi-controller

This is just like commit ac00546a ("arm64: dts: qcom: sc7180:
Rename gic-its node to msi-controller") but for sdm845.  This fixes
all arm64/qcom device trees that I could find.
Reviewed-by: Rajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20191216222021.1.I684f124a05a1c3f0b113c8d06d5f9da5d69b801e@changeidSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/boot/dts/qcom/sdm845.dtsi

@@ -3203,7 +3203,7 @@ intc: interrupt-controller@17a00000 {
 			      <0 0x17a60000 0 0x100000>;    /* GICR * 8 */
 			interrupts = <GIC_PPI 9 IRQ_TYPE_LEVEL_HIGH>;
 
-			gic-its@17a40000 {
+			msi-controller@17a40000 {
 				compatible = "arm,gic-v3-its";
 				msi-controller;
 				#msi-cells = <1>;