dp: Switch DP thread trigger from semaphore to event #879

Job	Run time
build-windows (tgl tgl-h)	11m 23s
build-linux (zmain, tgl tgl-h)	3m 33s
manifest-check	2m 58s
build-linux (zmain, mtl lnl)	4m 0s
build-linux (mnfst, mtl lnl)	5m 47s
build-windows (imx8 imx8x imx8m imx8ulp)	15m 16s
build-windows (mtl lnl)	11m 7s
build-windows (ptl)	9m 32s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 44s
build-linux (zmain, ptl)	3m 38s
build-windows (-d, lnl)	8m 38s
build-linux (mnfst, --all)	17m 21s
LP64-WIP	4m 0s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	3m 25s
build-linux (mnfst, ptl)	5m 33s
build-linux (mnfst, tgl tgl-h)	5m 25s
build-linux (-d, mnfst, lnl)	4m 36s
compare-linux-win	40s
	2h 3m 36s

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