ARM: dts: qcom-msm8974-fp2: Use &labels

Use &labels to align with the style used in new DTS and apply tiny
style fixes.
Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
[bjorn: Rebased on top of Krzysztof underscore fixes]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220415115633.575010-10-konrad.dybcio@somainline.org

arch/arm/boot/dts/qcom-msm8974.dtsi

@@ -1590,7 +1590,7 @@ dsi0_phy: dsi-phy@fd922a00 {
 			};
 		};
 
-		imem@fe805000 {
+		imem: imem@fe805000 {
 			status = "disabled";
 			compatible = "syscon", "simple-mfd";
 			reg = <0xfe805000 0x1000>;