ARM: dts: mmp2-olpc-xo-1-75: Fix camera I2C node validation

mmp2-olpc-xo-1-75.dt.yaml: camera_i2c: $nodename:0:
      'camera_i2c' does not match '^i2c(@.*)?'
  mmp2-olpc-xo-1-75.dt.yaml: camera_i2c: 'sda-gpios' is a required property
  mmp2-olpc-xo-1-75.dt.yaml: camera_i2c: 'scl-gpios' is a required property

The "gpios" property actually was documented as deprecated, but got dropped
in commit 0175ce4a ("dt-bindings: i2c: Convert i2c-gpio binding to
json-schema"). It's probably best kept forgotten though.

Link: https://lore.kernel.org/r/20200718205019.184927-2-lkundrak@v3.skSigned-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts

@@ -77,10 +77,10 @@ headphone_insert {
 		};
 	};
 
-	camera_i2c {
+	i2c {
 		compatible = "i2c-gpio";
-		gpios = <&gpio 109 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>,
-			<&gpio 108 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+		sda-gpios = <&gpio 109 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+		scl-gpios = <&gpio 108 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 		#address-cells = <1>;
 		#size-cells = <0>;
 		i2c-gpio,timeout-ms = <1000>;