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/Makefile b/board/freescale/mx7ulp_evk/Makefile
new file mode 100644
index 0000000..5e19eb4
--- /dev/null
+++ b/board/freescale/mx7ulp_evk/Makefile
@@ -0,0 +1,10 @@
+# (C) Copyright 2016 Freescale Semiconductor, Inc.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y  := mx7ulp_evk.o
+
+extra-$(CONFIG_USE_PLUGIN) :=  plugin.bin
+$(obj)/plugin.bin: $(obj)/plugin.o
+	$(OBJCOPY) -O binary --gap-fill 0xff $< $@