Tools: Testbench: Fix IPC4 PGA controls load #19177

Job	Run time
LP64-WIP	1m 7s
build-windows (imx8 imx8x imx8m imx8ulp)	53s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	29s
build-windows (mtl)	54s
manifest-check	47s
build-linux (mnfst, mtl)	1s
build-windows (tgl tgl-h)	38s
build-linux (mnfst, lnl)	26s
build-windows (-d, mtl)	5m 50s
build-linux (mnfst, tgl tgl-h)	1s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	1s
build-linux (zmain, mtl)	1s
build-linux (zmain, lnl)	1s
build-linux (zmain, tgl tgl-h)	1s
build-linux (-d, mnfst, mtl)	42s
build-linux (mnfst, --all)	1s
compare-linux-win	16s
	12m 9s

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