drivers: video: Add VIDEO_BUF_STARTED to poll signals #135388

Job	Run time
twister-build-prep	2m 45s
twister-build (1)	31m 15s
twister-build (2)	37m 59s
twister-build (3)	25m 2s
twister-build (4)	36m 33s
twister-build (5)	18m 42s
twister-build (6)	23m 21s
twister-build (7)	23m 26s
Publish Unit Tests Results	12s
Check Twister Status / all jobs passed	1s
	3h 19m 16s

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