Create board IDs for unknown, 1.2A and 1.2B boards.

Infer board type based on initial GPIO input value.

In Unknown flavor, most GPIO/MPP are set for input, only those pins
needed to bring up access to the eMMC and network (and that are common
to all three board variants) are modified.

Chimera 1.2a bringup changes:
- Temporarily hardcode board id to 1.2a value.
- Initially take Craft PHY out of reset so it can be used in U-boot.

Change-Id: I14a2094dac9d705d8b02fd76978b9a901fb19873
10 files changed