board: atmel: Add SAMA5D27 giant board

Giant board is a tiny SBC based on the Adafruit Feather form factor,
created by groboards it contains a SAMA5D2 processor (SAMA5D27),
128 MB of RAM and a microSD card for storage.

Signed-off-by: Greg Gallagher <greg@embeddedgreg.com>
4 files changed