Build ATF images for i.MX8MP. Tested on Kontron OSM-S/BL i.MX8MP.
The default IMX_BOOT_UART_BASE for imx8mp platforms is 0x30890000, which
would be UART2. The Kontron board however uses UART3 as serial debug
console. As a result, after loading BL31 the system hangs.
Setting IMX_BOOT_UART_BASE=auto will fix it.
Signed-off-by: Martin Schiller <ms@dev.tdt.de>
