scripts/xtensa-build-zephyr.py: Allow for alternate toolchain versions #19543

Job	Run time
LP64-WIP	4m 14s
manifest-check	52s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 1s
build-linux (mnfst, mtl)	4m 23s
build-windows (imx8 imx8x imx8m imx8ulp)	7m 49s
build-linux (mnfst, lnl)	4m 18s
build-windows (mtl)	5m 41s
build-linux (mnfst, tgl tgl-h)	5m 33s
build-windows (tgl tgl-h)	6m 18s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 17s
build-windows (-d, mtl)	5m 33s
build-linux (zmain, mtl)	4m 29s
build-linux (zmain, lnl)	4m 18s
build-linux (zmain, tgl tgl-h)	5m 29s
build-linux (-d, mnfst, mtl)	4m 25s
build-linux (mnfst, --all)	12m 36s
compare-linux-win	28s
	1h 28m 44s

Provide feedback