imx: imx7ulp: add EVK board support

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 <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/board/freescale/mx7ulp_evk/MAINTAINERS b/board/freescale/mx7ulp_evk/MAINTAINERS
new file mode 100644
index 0000000..1aa2644
--- /dev/null
+++ b/board/freescale/mx7ulp_evk/MAINTAINERS
@@ -0,0 +1,7 @@
+MX7ULPEVK BOARD
+M:	Peng Fan <peng.fan@nxp.com>
+S:	Maintained
+F:	board/freescale/mx7ulp_evk/
+F:	include/configs/mx7ulp_evk.h
+F:	configs/mx7ulp_evk_defconfig
+F:	configs/mx7ulp_evk_plugin_defconfig