boards: add support for eval-adin1110ebz

Add support for ADI EVAL-ADIN1110EBZ.

Tested samples:
      * hello_world
      * blinky
      * dhcpv4_client
      * adt7420

Tested proper SPI detection of the ADIN1110 chip.

Co-developed-by: Philip Molloy <pmolloy@baylibre.com>
Signed-off-by: Philip Molloy <pmolloy@baylibre.com>
Signed-off-by: Angelo Dureghello <adureghello@baylibre.com>