Add sof_sys_user_heap_get() and APP_SYSUSER_DATA/BSS macros #22998

Job	Run time
manifest-check	2m 45s
build-windows (mnfst, imx8 imx8x)	11m 2s
LP64-WIP	3m 51s
build-windows (mnfst, lnl)	9m 6s
build-windows (mnfst, imx8m imx8ulp)	13m 27s
build-windows (mnfst, ptl)	11m 17s
build-linux (mnfst, tgl)	4m 19s
build-linux (mnfst, mtl)	4m 46s
build-windows (mnfst, tgl-h)	8m 37s
build-linux (mnfst, tgl-h)	4m 17s
build-linux (mnfst, imx8 imx8x)	4m 57s
build-linux (mnfst, imx8m imx8ulp)	5m 9s
build-linux (mnfst, wcl imx95)	7m 34s
build-linux (mnfst, ptl)	5m 59s
build-windows (-d, mnfst, lnl)	9m 5s
build-linux (mnfst, lnl)	4m 52s
build-windows (mnfst, mtl)	10m 34s
build-windows (mnfst, tgl)	9m 38s
build-linux (-d, mnfst, lnl)	5m 14s
compare-linux-win	33s
	2h 17m 2s

Provide feedback