board: phytec: common: Add product information to FTD

board: phytec: common: Add product information to FTD

ft_board_setup inside the board code allows to alter
device-tree during the boot process.

Introduce a new function for the PHYTEC SOM detection
to read the product name and part number from the EEPROM
content and include both into the device-tree as
* phytec,som-part-number
* phytec,som-product-name

This function can be called from the board code when those
values should be exposed to Linux.

This patch also updates the phytec_print_som_info
function and changes the output.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
Reviewed-by: Wadim Egorov <w.egorov@phytec.de>
Tested-by: Wadim Egorov <w.egorov@phytec.de>