app: boards: intel_adsp_ace15_mtpm: disable IMR context-save #617

Job	Run time
LP64-WIP	3m 57s
manifest-check	46s
build-windows (imx8 imx8x imx8m imx8ulp)	8m 25s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	5m 54s
build-windows (mtl)	6m 16s
build-linux (mnfst, mtl)	4m 11s
build-windows (tgl tgl-h)	6m 32s
build-linux (mnfst, lnl)	4m 2s
build-windows (-d, mtl)	6m 37s
build-linux (mnfst, tgl tgl-h)	5m 4s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	3m 39s
build-linux (zmain, mtl)	3m 31s
build-linux (zmain, lnl)	3m 33s
build-linux (zmain, tgl tgl-h)	3m 40s
build-linux (-d, mnfst, mtl)	4m 12s
compare-linux-win	22s
	1h 10m 41s

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