Add EVK board support.
Add the evk dts file.
LOG:
U-Boot 2017.03-rc2-00038-gab86c1d (Feb 22 2017 - 15:59:58 +0800)
CPU: Freescale i.MX7ULP rev1.0 at 500 MHz
Reset cause: POR
Boot mode: Dual boot
Model: NXP i.MX7ULP EVK
DRAM: 1 GiB
MMC: FSL_SDHC: 0
In: serial@402D0000
Out: serial@402D0000
Err: serial@402D0000
Net: Net Initialization Skipped
No ethernet found.
Hit any key to stop autoboot: 0
Signed-off-by: Peng Fan
Cc: Stefano Babic
