Remove unused config variables #15393

Job	Run time
raspi-2 / initialize	47s
raspi-2-skia / initialize	45s
raspi-2-skia / docker-build-image	1m 36s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	1m 39s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	21m 19s
raspi-2-skia / raspi-2-skia_debug	23m 48s
raspi-2-skia / raspi-2-skia_qa	13m 48s
raspi-2-skia / raspi-2-skia_gold	12m 29s
raspi-2 / raspi_devel	18m 2s
raspi-2 / raspi_debug	23m 6s
raspi-2 / raspi_qa	12m 49s
raspi-2 / raspi_gold	12m 29s
raspi-2 / sbversion-17_devel	18m 23s
raspi-2 / sbversion-17_debug	22m 40s
raspi-2 / sbversion-17_qa	12m 53s
raspi-2 / sbversion-17_gold	12m 29s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
	3h 29m 2s

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