arm64: dts: imx8mm: Use 100 kHz I2C2 on Data Modul i.MX8M Mini eDM SBC

The I2C2 has SMBus device SMSC USB2514Bi connected to it, the device is
capable of up to 100 kHz operation. Reduce the bus frequency to 100 kHz
to guarantee this I2C device can work correctly.

Fixes: 583f24ae ("arm64: dts: imx8mm: Add support for Data Modul i.MX8M Mini eDM SBC")
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@denx.de>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: NXP Linux Team <linux-imx@nxp.com>
To: linux-arm-kernel@lists.infradead.org
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc.dts

@@ -392,7 +392,7 @@ ldo6_reg: LDO6 {
 
 &i2c2 {
 	/* IMX8MM ERRATA e7805 -- I2C is limited to 384 kHz due to SoC bug */
-	clock-frequency = <320000>;
+	clock-frequency = <100000>;
 	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_i2c2>;
 	pinctrl-1 = <&pinctrl_i2c2_gpio>;