MIPS: BMIPS: Add I2C node for bcm7360

MIPS: BMIPS: Add I2C node for bcm7360

Add I2C device nodes to BMIPS based BCM7360 platform.

Signed-off-by: Jaedon Shin <jaedon.shin@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Cc: Wolfram Sang <wsa@the-dreams.de>
Cc: Kamal Dasu <kdasu.kdev@gmail.com>
Cc: linux-i2c@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11335/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>