FreeBSD/src 0eb610e (r346701)stand/efi/loader autoload.c, stand/fdt fdt_loader_cmd.c fdt_platform.h

loader: fdt: Add fdt_is_setup function

When efi_autoload is called it will call fdt_setup_fdtp which setup the
dtb and overlays. If a user already loaded at dtb or overlays or just
printed the efi provided dtb, this will re-setup everything and also
re-applying the overlays.
Test that everything is setup before doing it again.

Reviewed by:    kevans
Differential Revision:  https://reviews.freebsd.org/D20059
DeltaFile
+10-0stand/fdt/fdt_loader_cmd.c
+2-1stand/efi/loader/autoload.c
+1-0stand/fdt/fdt_platform.h
+13-13 files

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