arm64: dts: imx8mq-librem5: Reduce I2C frequency to 384kHz

According to imx8mq errata (ERR007805):

> To meet the clock low period requirement in fast speed mode,
> SCL must be configured to 384KHz or less.

Note that the imx i2c driver already implements this erratum and works
around it. This is only for the description to reflect reality.
Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi

@@ -778,7 +778,7 @@ MX8MQ_IOMUXC_GPIO1_IO02_WDOG1_WDOG_B	0x1f
 };
 
 &i2c1 {
-	clock-frequency = <387000>;
+	clock-frequency = <384000>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_i2c1>;
 	status = "okay";
@@ -976,7 +976,7 @@ rtc@68 {
 };
 
 &i2c2 {
-	clock-frequency = <387000>;
+	clock-frequency = <384000>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_i2c2>;
 	status = "okay";
@@ -1025,7 +1025,7 @@ accel_gyro: accel-gyro@6a	{
 };
 
 &i2c3 {
-	clock-frequency = <387000>;
+	clock-frequency = <384000>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_i2c3>;
 	status = "okay";
@@ -1115,7 +1115,7 @@ touchscreen@38 {
 };
 
 &i2c4 {
-	clock-frequency = <387000>;
+	clock-frequency = <384000>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_i2c4>;
 	status = "okay";