[PATCH v3] imx8mq: configs: add support for distro boot commands

[sbabic at denx.de]

> From: Alice Guo <alice.guo at nxp.com>
> Supported boot device types in iMX8MQ: MMC, DHCP.
> CONFIG_DISTRO_DEFAULTS is added for enabling the DISTRO_DEFAULTS option.
> CONFIG_BOOTCOMMAND which is defined in include/configs/imx8mq_evk.h is
> deleted because "run distro_bootcmd" is required to be the default boot
> mode.
> scriptaddr is the location in RAM where boot.scr.uimg/boot.scr will be
> loaded to prior to execution.
> kernel_addr_r is the location in RAM where the kernel will be loaded to.
> Delete unnecessary environment variables because "run distro_bootcmd" is
> set to be the default boot mode.
> Signed-off-by: Alice Guo <alice.guo at nxp.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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