Merge branch 'nrb/libubootenv' into 'main'

etc: add config files for libubootenv

See merge request reform/reform-system-image!28

reform2-imx8mq/template-etc/fw_env.config

+/dev/mmcblk0boot0 	-0x2000 	0x2000

reform2-imx8mq/template-etc/u-boot-inital-env

+board=MNT Reform 2.0
+soc=imx8mq
+fdt_addr=0x50000000
+bootargs='noinitrd root=/dev/mmcblk1p1 rootwait rw console=ttymxc0,115200 console=tty1 cma=512M pci=nomsi'
+bootcmd='ext4load mmc 1 ${loadaddr} /Image; ext4load mmc 1 ${fdt_addr} /imx8mq-mnt-reform2.dtb; booti ${loadaddr} - ${fdt_addr}'
+loadaddr=0x40480000