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adapt README with imx8m specific parts.
Signed-off-by: Heiko Schocher <hs@denx.de>

Signed-off-by: Stefano Babic <sbabic@denx.de>

The initram,fs startup script reads a configuration file
(/etc/default/initramfs) to know if:
- rootfs must be verified
- rootfs is encrypted

Change initramfs to load key from blob, and start encrypted rootfs
Signed-off-by: Stefano Babic <sbabic@denx.de>

Signed-off-by: Stefano Babic <sbabic@denx.de>
Signed-off-by: Heiko Schocher <hs@denx.de>

- includes secure boot using HAB
- encrypted roorfs using DCP with eMMC

TODO:
- include CAAM
- Add support for UBI and block device
Signed-off-by: Parthiban Nallathambi <pn@denx.de>