ARM: dts: qcom: Fix node name for NAND controller node

Use the common "nand-controller" node name for NAND controller node to
fix the `make dtbs_check` validation for Qcom platforms.
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20210408170457.91409-10-manivannan.sadhasivam@linaro.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm/boot/dts/qcom-ipq4019.dtsi

@@ -480,7 +480,7 @@ qpic_bam: dma@7984000 {
 			status = "disabled";
 		};
 
-		nand: qpic-nand@79b0000 {
+		nand: nand-controller@79b0000 {
 			compatible = "qcom,ipq4019-nand";
 			reg = <0x79b0000 0x1000>;
 			#address-cells = <1>;

arch/arm/boot/dts/qcom-sdx55.dtsi

@@ -294,7 +294,7 @@ qpic_bam: dma-controller@1b04000 {
 			status = "disabled";
 		};
 
-		qpic_nand: nand@1b30000 {
+		qpic_nand: nand-controller@1b30000 {
 			compatible = "qcom,sdx55-nand";
 			reg = <0x01b30000 0x10000>;
 			#address-cells = <1>;