ipq806x: use consistent DT labels for gsbiX_serial

Kernel uses the label gsbiX_serial, so let's adjust our labels to
this naming scheme.

This is cosmetic, and actually only already existing gsbi4_serial
has been used at all.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/ipq806x/files-4.19/arch/arm/boot/dts/qcom-ipq8064.dtsi

@@ -818,7 +818,7 @@
 
 			syscon-tcsr = <&tcsr>;
 
-			uart2: serial@12490000 {
+			gsbi2_serial: serial@12490000 {
 				compatible = "qcom,msm-uartdm-v1.3", "qcom,msm-uartdm";
 				reg = <0x12490000 0x1000>,
 				      <0x12480000 0x1000>;
@@ -893,7 +893,7 @@
 
 			syscon-tcsr = <&tcsr>;
 
-			uart5: serial@1a240000 {
+			gsbi5_serial: serial@1a240000 {
 				compatible = "qcom,msm-uartdm-v1.3", "qcom,msm-uartdm";
 				reg = <0x1a240000 0x1000>,
 				      <0x1a200000 0x1000>;

target/linux/ipq806x/files-5.4/arch/arm/boot/dts/qcom-ipq8064.dtsi

@@ -876,7 +876,7 @@
 
 			syscon-tcsr = <&tcsr>;
 
-			uart2: serial@12490000 {
+			gsbi2_serial: serial@12490000 {
 				compatible = "qcom,msm-uartdm-v1.3", "qcom,msm-uartdm";
 				reg = <0x12490000 0x1000>,
 					  <0x12480000 0x1000>;
@@ -951,7 +951,7 @@
 
 			syscon-tcsr = <&tcsr>;
 
-			uart5: serial@1a240000 {
+			gsbi5_serial: serial@1a240000 {
 				compatible = "qcom,msm-uartdm-v1.3", "qcom,msm-uartdm";
 				reg = <0x1a240000 0x1000>,
 					  <0x1a200000 0x1000>;