boards: up_squared: dts: fix a typo in I2C address
boards: up_squared: dts: fix a typo in I2C address

The address to the I2C6 controller has a typo. So fix it.

Signed-off-by: Daniel Leung <d94e04d205b5962d7873a139ef298b03c1717f72@intel.com>

Vudentz/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr,punitvara/zephyr,galak/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,nashif/zephyr,punitvara/zephyr,Vudentz/zephyr,ldts/zephyr,finikorg/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,nashif/zephyr,nashif/zephyr,punitvara/zephyr,Vudentz/zephyr,punitvara/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,explora26/zephyr,Vudentz/zephyr,finikorg/zephyr,Vudentz/zephyr,ldts/zephyr,finikorg/zephyr,explora26/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,explora26/zephyr,galak/zephyr