MIPS: dts: mscc: enable i2c on ocelot_pcb123

Enable the i2c controller on ocelot PCB123. While there are no i2c devices
on the board itself, it can be used to control the SFP transceivers.

Signed-off-by: Alexandre Belloni <[e-mail]>
Signed-off-by: Paul Burton <[e-mail]>
Patchwork: https://patchwork.linux-mips.org/patch/20352/
Cc: Wolfram Sang <[e-mail]>
Cc: Jarkko Nikula <[e-mail]>
Cc: James Hogan <[e-mail]>
Cc: Andy Shevchenko <[e-mail]>
Cc: Mika Westerberg <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: Thomas Petazzoni <[e-mail]>
Cc: Allan Nielsen <[e-mail]>

arch/mips/boot/dts/mscc/ocelot_pcb123.dts

···
 	};
 };
 
+&i2c {
+	clock-frequency = <100000>;
+	i2c-sda-hold-time-ns = <300>;
+	status = "okay";
+};
+
 &mdio0 {
 	status = "okay";
 };