boards: nrf52_blenano2: Add i2c's to nrf52_blenano2 board dts.

Fixes #8391

Enables the i2c drivers for these boards.
Required to enable i2c with these boards.
Tested samples/sensor/tmp112 for nrf52_blenano2
with i2c enabled.

Signed-off-by: Mandar Chandrakant Thorat <mandar.chandrakant.thorat@intel.com>