ARM: atmel: add sama5d4 xplained ultra board support

The code for this board supports following features:
- Boot media support: NAND flash/SD card/SPI flash
- Support LCD display (optional, disa

ARM: atmel: add sama5d4 xplained ultra board support

The code for this board supports following features:
- Boot media support: NAND flash/SD card/SPI flash
- Support LCD display (optional, disabled by default)
- Support ethernet
- Support USB mass storage

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>

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