ARM: at91: dt: add device tree file for SAMA5D4 SoC

Add SAMA5D4 SoC DT file.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
ARM: at91: dt: add device tree file for SAMA5D4ek board

Add reference SAMA5D4-EK platform DT file.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
ARM: at91: add sama5d4 support to sama5_defconfig

Add sama5d4 to sama5_defconfig to build kernel booting on both sama5d3 and
samad4.

Note that earlyprintk can only be working for one or the other.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
ARM: at91: document Atmel SMART compatibles

Document all the available compatibles for Atmel "SMART" SoCs.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Merge branch 'at91-3.18-soc2' into at91-3.18-resolved2

Conflicts:
	arch/arm/mach-at91/setup.c