boards: arm: rpi_pico: Remove i2c1 node

Zephyr's default settings usually enable the only minimum of peripherals,
and rpi_pico already has `i2c0` enabled.
Remove the `i2c1` node configuration.

Signed-off-by: TOKITA Hiroshi <[email protected]>

Author: soburi

boards/arm/rpi_pico/rpi_pico-pinctrl.dtsi

@@ -24,14 +24,6 @@
 		};
 	};
 
-	i2c1_default: i2c1_default {
-		group1 {
-			pinmux = <I2C1_SDA_P14>, <I2C1_SCL_P15>;
-			input-enable;
-			input-schmitt-enable;
-		};
-	};
-
 	spi0_default: spi0_default {
 		group1 {
 			pinmux = <SPI0_CSN_P17>, <SPI0_SCK_P18>, <SPI0_TX_P19>;

boards/arm/rpi_pico/rpi_pico.dts

@@ -99,13 +99,6 @@
 	pinctrl-names = "default";
 };
 
-&i2c1 {
-	clock-frequency = <I2C_BITRATE_STANDARD>;
-	status = "okay";
-	pinctrl-0 = <&i2c1_default>;
-	pinctrl-names = "default";
-};
-
 &spi0 {
 	clock-frequency = <DT_FREQ_M(8)>;
 	status = "okay";