ARM: dts: imx: add imx6ul and imx6ul evk board support

Add new SOC i.MX6UL dtb file support, including evk board
support

i.MX6 Ultralite processor include one ARM cortext-A7 core.
Offer high perfomance and lowest power consumption.

Main included:
- 4 MMC/SD/SDIO
- 2 USB 2.0 OTG
- 3 I2S/SAI/AC97
- 4 eCSPI
- 4 I2C
- 2 ENET
- 2 CAN
- 3 wdog
- ASRC
- 8 uart
- LCDIF
- PXP

Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Fancy Fang <chen.fang@freescale.com>
Signed-off-by: Frank Li <Frank.Li@freescale.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>