pico-imx7d: Add initial support

Add the initial support for pico-imx7d board based on Wig Cheng's
source code.

Add support for eMMC, USB gadget, I2C, PMIC and Ethernet.

For more information about this board, please visit:
http://www.technexion.org/products/pico/pico-som/pico-imx7-emmc

Signed-off-by: Vanessa Maegima <vanessa.maegima@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
diff --git a/board/technexion/pico-imx7d/MAINTAINERS b/board/technexion/pico-imx7d/MAINTAINERS
new file mode 100644
index 0000000..276162a
--- /dev/null
+++ b/board/technexion/pico-imx7d/MAINTAINERS
@@ -0,0 +1,7 @@
+Technexion PICO-IMX7D board
+M:	Wig Cheng <wig.cheng@technexion.com>
+M:	Vanessa Maegima <vanessa.maegima@nxp.com>
+S:	Maintained
+F:	board/technexion/pico-imx7d/
+F:	include/configs/pico-imx7d.h
+F:	configs/pico-imx7d_defconfig