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/configs/mx7ulp_evk_plugin_defconfig b/configs/mx7ulp_evk_plugin_defconfig
new file mode 100644
index 0000000..87a9324
--- /dev/null
+++ b/configs/mx7ulp_evk_plugin_defconfig
@@ -0,0 +1,18 @@
+CONFIG_ARM=y
+CONFIG_ARCH_MX7ULP=y
+CONFIG_TARGET_MX7ULP_EVK=y
+CONFIG_USE_IMXIMG_PLUGIN=y
+CONFIG_DEFAULT_DEVICE_TREE="imx7ulp-evk"
+CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/mx7ulp_evk/imximage.cfg"
+CONFIG_HUSH_PARSER=y
+CONFIG_CMD_I2C=y
+CONFIG_OF_CONTROL=y
+CONFIG_DM=y
+CONFIG_DM_GPIO=y
+CONFIG_IMX_RGPIO2P=y
+CONFIG_DM_I2C=y
+CONFIG_SYS_LPI2C_IMX=y
+CONFIG_PINCTRL=y
+CONFIG_PINCTRL_IMX7ULP=y
+CONFIG_DM_SERIAL=y
+CONFIG_FSL_LPUART=y