dts: beaglebone: Add I2C definitions for EEPROMs & capes

Add the I2C definitions for the EEPROM devices on the baseboard
and on the possibly connected capes.

Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>
arm: beaglebone: dts: Add capemanager to the DTS

Add the capemanager in the bone/beaglebone DTS.

Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>