Update I2C Driver to BlockDevice Driver

## Suggestion
Update the I2C driver to use https://github.com/armmbed/i2ceeprom-driver instead as this is maintained by the ARM mbed team and has support for BlockDevice which enables the File System driver.

## Priority : Low

This is not necessary, but should be considered long term.

Inspect the current I2C driver entry point and compare it with the ARM mbed i2ceeprom-driver linked in the issue. Check how the existing driver connects to the File System and determine whether the replacement provides the required BlockDevice support; done means the shield uses the maintained driver without losing that integration.

Written by the indexing model from the issue text.