src/platform: Add "mtk" Zephyr platform for MediaTek DSPs #19591

Job	Run time
LP64-WIP	4m 3s
manifest-check	56s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 26s
build-windows (imx8 imx8x imx8m imx8ulp)	7m 43s
build-linux (mnfst, mtl)	4m 41s
build-windows (mtl)	6m 24s
build-linux (mnfst, lnl)	4m 40s
build-windows (tgl tgl-h)	6m 38s
build-linux (mnfst, ptl)	4m 38s
build-windows (-d, mtl)	6m 10s
build-linux (mnfst, tgl tgl-h)	5m 25s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	7m 7s
build-linux (zmain, mtl)	4m 36s
build-linux (zmain, lnl)	4m 22s
build-linux (zmain, ptl)	4m 55s
build-linux (zmain, tgl tgl-h)	6m 4s
build-linux (-d, mnfst, mtl)	4m 48s
build-linux (mnfst, --all)	13m 55s
compare-linux-win	32s
	1h 44m 3s

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