Add support for the PHYTEC phyBOARD-Mira Low-Cost Rapid Development Kit
with i.MX 6DualLight/Solo with NAND.

Following interfaces are supported:
- 100 MBit Ethernet
- USB Host
- RS232
- HDMI
Signed-off-by: NChristian Hemp <c.hemp@phytec.de>
Signed-off-by: NStefan Christ <s.christ@phytec.de>
Signed-off-by: NStefan Riedmueller <s.riedmueller@phytec.de>
Reviewed-by: NFabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>