ARM: dts: vf610-zii-scu4-aib: Drop unused pinctrl_i2c3 pinmux config

Pinctrl_i2c3 pinmux config is not used anywhere. Drop it.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Cory Tusar <cory.tusar@zii.aero>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/vf610-zii-scu4-aib.dts

@@ -792,13 +792,6 @@ VF610_PAD_PTA23__I2C2_SDA		0x37ff
 		>;
 	};
 
-	pinctrl_i2c3: i2c3grp {
-		fsl,pins = <
-			VF610_PAD_PTA30__I2C3_SCL		0x37ff
-			VF610_PAD_PTA31__I2C3_SDA		0x37ff
-		>;
-	};
-
 	pinctrl_leds_debug: pinctrl-leds-debug {
 		fsl,pins = <
 			 VF610_PAD_PTB26__GPIO_96		0x31c2