arm64: dts: synaptics: Use generic "ngpios" rather than "snps,nr-gpios"

This is to remove similar errors as below:

OF: /.../gpio-port@0: could not find phandle

Commit 7569486d ("gpio: dwapb: Add ngpios DT-property support")
explained the reason of above errors well and added the generic
"ngpios" property, let's use it.
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>

arch/arm64/boot/dts/synaptics/as370.dtsi

@@ -143,7 +143,7 @@ porta: gpio-port@0 {
 					compatible = "snps,dw-apb-gpio-port";
 					gpio-controller;
 					#gpio-cells = <2>;
-					snps,nr-gpios = <32>;
+					ngpios = <32>;
 					reg = <0>;
 					interrupt-controller;
 					#interrupt-cells = <2>;
@@ -161,7 +161,7 @@ portb: gpio-port@1 {
 					compatible = "snps,dw-apb-gpio-port";
 					gpio-controller;
 					#gpio-cells = <2>;
-					snps,nr-gpios = <32>;
+					ngpios = <32>;
 					reg = <0>;
 					interrupt-controller;
 					#interrupt-cells = <2>;

arch/arm64/boot/dts/synaptics/berlin4ct.dtsi

@@ -140,7 +140,7 @@ porta: gpio-port@0 {
 					compatible = "snps,dw-apb-gpio-port";
 					gpio-controller;
 					#gpio-cells = <2>;
-					snps,nr-gpios = <32>;
+					ngpios = <32>;
 					reg = <0>;
 					interrupt-controller;
 					#interrupt-cells = <2>;
@@ -158,7 +158,7 @@ portb: gpio-port@1 {
 					compatible = "snps,dw-apb-gpio-port";
 					gpio-controller;
 					#gpio-cells = <2>;
-					snps,nr-gpios = <32>;
+					ngpios = <32>;
 					reg = <0>;
 					interrupt-controller;
 					#interrupt-cells = <2>;
@@ -176,7 +176,7 @@ portc: gpio-port@2 {
 					compatible = "snps,dw-apb-gpio-port";
 					gpio-controller;
 					#gpio-cells = <2>;
-					snps,nr-gpios = <32>;
+					ngpios = <32>;
 					reg = <0>;
 					interrupt-controller;
 					#interrupt-cells = <2>;
@@ -194,7 +194,7 @@ portd: gpio-port@3 {
 					compatible = "snps,dw-apb-gpio-port";
 					gpio-controller;
 					#gpio-cells = <2>;
-					snps,nr-gpios = <32>;
+					ngpios = <32>;
 					reg = <0>;
 					interrupt-controller;
 					#interrupt-cells = <2>;
@@ -269,7 +269,7 @@ porte: gpio-port@4 {
 					compatible = "snps,dw-apb-gpio-port";
 					gpio-controller;
 					#gpio-cells = <2>;
-					snps,nr-gpios = <32>;
+					ngpios = <32>;
 					reg = <0>;
 				};
 			};
@@ -284,7 +284,7 @@ portf: gpio-port@5 {
 					compatible = "snps,dw-apb-gpio-port";
 					gpio-controller;
 					#gpio-cells = <2>;
-					snps,nr-gpios = <32>;
+					ngpios = <32>;
 					reg = <0>;
 				};
 			};