imx8m spl: load the M4 code from the boot partition
For eMMC booting from one of their hardware boot partitions, load the M4 binary from the hwpartition the SPL booted from. This enables booting U-boot entirely from the eMMC boot1 or boot2 hwpartitions, thus keeping the bootloader and all the SoC-specific boot black magic out of the way of the user.
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