zephyr: alloc: Use generic is_heap_pointer for L3 heap #885

Job	Run time
build-windows (-d, lnl)	9m 36s
build-windows (ptl)	9m 40s
build-windows (mtl lnl)	9m 41s
LP64-WIP	4m 14s
build-windows (tgl tgl-h)	9m 42s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	4m 9s
build-linux (mnfst, ptl)	5m 59s
build-windows (imx8 imx8x imx8m imx8ulp)	9m 41s
build-linux (zmain, tgl tgl-h)	3m 54s
build-linux (mnfst, --all)	9m 30s
build-linux (mnfst, mtl lnl)	6m 6s
build-linux (zmain, ptl)	4m 48s
build-linux (zmain, mtl lnl)	3m 37s
manifest-check	3m 20s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	7m 29s
build-linux (mnfst, tgl tgl-h)	6m 21s
build-linux (-d, mnfst, lnl)	4m 44s
compare-linux-win	27s
	1h 52m 58s

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