starboard/types.h: Remove some unused types #15567

Job	Run time
raspi-2 / initialize	44s
raspi-2-skia / initialize	43s
raspi-2-skia / docker-build-image	2m 5s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	2m 6s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	25m 42s
raspi-2-skia / raspi-2-skia_debug	25m 47s
raspi-2-skia / raspi-2-skia_qa	15m 0s
raspi-2-skia / raspi-2-skia_gold	14m 34s
raspi-2 / raspi_devel	20m 14s
raspi-2 / raspi_debug	25m 13s
raspi-2 / raspi_qa	14m 23s
raspi-2 / raspi_gold	14m 1s
raspi-2 / sbversion-17_devel	20m 7s
raspi-2 / sbversion-17_debug	25m 10s
raspi-2 / sbversion-17_qa	14m 22s
raspi-2 / sbversion-17_gold	13m 59s
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 54m 10s

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