llext: export DT devices to extensions #136477

Job	Run time
twister-build-prep	3m 0s
twister-build (1)	56m 48s
twister-build (2)	46m 21s
twister-build (3)	41m 26s
twister-build (4)	1h 7m 36s
twister-build (5)	28m 19s
twister-build (6)	28m 39s
twister-build (7)	49m 42s
Publish Unit Tests Results	12s
Check Twister Status / all jobs passed	1s
	5h 22m 4s

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