idc: check if secondary core is down before sending IDC #15617

Job	Run time
LP64-WIP	3m 40s
manifest-check	53s
build-linux (mnfst, imx8 imx8x imx8m)	4m 17s
build-windows (imx8 imx8x imx8m)	6m 43s
build-linux (mnfst, mtl)	4m 4s
build-windows (mtl)	6m 24s
build-linux (mnfst, lnl)	4m 17s
build-windows (tgl tgl-h)	6m 34s
build-linux (mnfst, tgl tgl-h)	5m 18s
build-windows (-d, mtl)	6m 20s
build-linux (zmain, imx8 imx8x imx8m)	4m 21s
build-linux (zmain, mtl)	4m 22s
build-linux (zmain, lnl)	3m 52s
build-linux (zmain, tgl tgl-h)	4m 51s
build-linux (-d, mnfst, mtl)	4m 5s
compare-linux-win	28s
	1h 10m 29s

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