include: am654_evm: Establish initial environment for SD card boot

Create a basic U-Boot environment that allows the automatic loading
of a Linux Kernel located at /boot/Image and an associated device tree
blob located at /boot/k3-am654-base-board.dtb from the secondary
partition of an ext4-formatted SD card on the AM654x EVM. Furthermore
the boot.scr and uEnv.txt detection and loading schemes are supported
in a manner already known from other TI platforms.

Note that this is intended to be a starting point to enable initial
board use and will most certainly get extended and refactored as
different boot media become available.

Reviewed-by: Tom Rini <[email protected]>
Signed-off-by: Andreas Dannenberg <[email protected]>
Signed-off-by: Lokesh Vutla <[email protected]>

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