Merge git://git.denx.de/u-boot-dm

Here with some DM changes as well as the long-standing AT91 DM/DT
conversion patches which I have picked up via dm.

ARM: at91: dt: add dts file for sama5d3 Xplained

Add the device tree file for sama5d3 Xplained board.

The dts files are copied from the Linux-4.9, do changes as below.
- add the "u-boot,dm-pre-rel

ARM: at91: dt: add dts file for sama5d3 Xplained

Add the device tree file for sama5d3 Xplained board.

The dts files are copied from the Linux-4.9, do changes as below.
- add the "u-boot,dm-pre-reloc" property to determine which nodes
which are needed by SPL and by the board_init_f stage.
- fix the compile warning.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>

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