Enable support for the i.MX8MM EVK and some of its peripherals.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

The phyCORE-i.MX8M aka PCL-066 is a SoM containing a i.MX8M SoC.

phyCORE-i.MX8M:
 - 1GB LPDDR4 RAM
 - eMMC
 - microSD
 - Ethernet

Signed-off-by: Christian Hemp <christian.hemp@posteo.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Add support for the following ZII i.MX8MQ based boards:

   - ZII i.MX8MQ RMB3
   - ZII i.MX8MQ Zest

Most of the basic peripherals are supported by this patch. More
advanced features such as PCIe, display support, etc, are planned to
be added later.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Similar to imx_v7_defconfig, add imx_v8_defconfig as a default
configuration encompassing all ARMv8 based i.MX SoCs.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>