boards: imx8m: enable device PM runtime #19799

Job	Run time
LP64-WIP	4m 29s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 2s
build-windows (imx8 imx8x imx8m imx8ulp)	7m 50s
build-linux (mnfst, mtl lnl)	5m 45s
build-windows (mtl lnl)	7m 2s
manifest-check	49s
build-linux (mnfst, ptl)	4m 35s
build-windows (ptl)	6m 40s
build-linux (mnfst, tgl tgl-h)	5m 32s
build-windows (tgl tgl-h)	6m 42s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 32s
build-windows (-d, lnl)	5m 51s
build-linux (zmain, mtl lnl)	6m 1s
build-linux (zmain, ptl)	5m 0s
build-linux (zmain, tgl tgl-h)	5m 23s
build-linux (-d, mnfst, lnl)	4m 46s
build-linux (mnfst, --all)	12m 25s
compare-linux-win	24s
	1h 41m 48s

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