Merge patch series "PHYTEC SOM Detection API v3"

Daniel Schultz <d.schultz@phytec.de> says:

This patch series adds support for the EEPROM v3 API.

V3 is backwards compatible to V2 and therefore, the V2 image still
exists at the beginning. Only the API version changed from 2 to 3.

V3 is a block-based memory layout organized as singled-linked list
with different types of blocks. This is a more flexible approach and
allows us to extend it by more block types in the future.

The V3 data starts with a 8-byte large header which defines the
block count (u8), V3 subversion (u8) and data payload length (u16).
Additionally the header contains a CRC8 checksum a 3 reserved bytes.

Each block starts with a 4-byte large header which defined the
block type (u8), the absolute address of the next block (u16) and a
CRC8 checksum. The content itself is defined via the block type and
we currently have 2 different types:

1) MAC: Contains the Ethernet interface number (u8), MAC address
        (6 x u8) and a CRC8 checksum.