OpenThread HDLC RCP communication support #148779

Job	Run time
twister-build-prep / prep_pr	4m 10s
twister-build-prep / prep_push	0s
twister-build (1)	56m 36s
twister-build (2)	1h 41m 40s
twister-build (3)	34m 8s
twister-build (4)	34m 28s
twister-build (5)	37m 51s
twister-build (6)	34m 47s
twister-build (7)	25m 10s
twister-build (8)	38m 39s
twister-build (9)	33m 39s
Publish Unit Tests Results	21s
Check Twister Status / all jobs passed	1s
	6h 41m 30s

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