board: phytec: Add SOM detection for AM6x

Add all functions to read each SOM option from the EEPROM
image and detect whether it's the correct product for this
image.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>

board: phytec: common: Add imx8m specific EEPROM detection support

Add imx8m specific detection part. Which includes checking the
EEPROM data for article number options.

Signed-off-by: Teresa Remmet <t.remmet@phytec.de>
Reviewed-by: Yannic Moog <y.moog@phytec.de>
Tested-by: Yannic Moog <y.moog@phytec.de>

board: phytec: Add common PHYTEC SoM detection

Recent shipped PHYTEC SoMs come with an i2c EEPROM containing
information about the hardware such as board revision and variant.
This can be used for RAM detection and loading device tree overlays
during kernel start.

Signed-off-by: Teresa Remmet <t.remmet@phytec.de>
Reviewed-by: Yannic Moog <y.moog@phytec.de>
Tested-by: Yannic Moog <y.moog@phytec.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>

board: phytec: common: Add imx8m specific EEPROM detection support

Add imx8m specific detection part. Which includes checking the
EEPROM data for article number options.

Signed-off-by: Teresa Remmet <t.remmet@phytec.de>
Reviewed-by: Yannic Moog <y.moog@phytec.de>
Tested-by: Yannic Moog <y.moog@phytec.de>

board: phytec: Add common PHYTEC SoM detection

Recent shipped PHYTEC SoMs come with an i2c EEPROM containing
information about the hardware such as board revision and variant.
This can be used for RAM detection and loading device tree overlays
during kernel start.

Signed-off-by: Teresa Remmet <t.remmet@phytec.de>
Reviewed-by: Yannic Moog <y.moog@phytec.de>
Tested-by: Yannic Moog <y.moog@phytec.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>