Adding app command for fb

Added GUID and global enables commands.
On Tiogapass the GUID is stored in the EEPROM (the same EEPROM which
is used to store the FRUID) at a specific offset (towards the end)
which is known not to conflict with the FRUID. This change adds support
to read the device and system GUID from these locations.

Change-Id: If999349b3a6e90bf5884bfc1f25340eb231661bf
Signed-off-by: Vijay Khemka <vijaykhemka@fb.com>
3 files changed