Disable Vulkan build when is_starboard is defined #16333

Job	Run time
android-cobalt-arm64 / initialize	1m 15s
android-arm / initialize	1m 17s
android-arm64 / initialize	1m 19s
android-cobalt-x86 / initialize	1m 17s
android-cobalt-arm / initialize	1m 14s
android-x86 / initialize	1m 20s
android-cobalt-arm / docker-build-image	3m 20s
android-cobalt-arm64 / docker-build-image	3m 28s
android-cobalt-x86 / docker-build-image	3m 42s
android-arm / docker-build-image	3m 12s
android-arm64 / docker-build-image	3m 10s
android-x86 / docker-build-image	3m 24s
android-arm / arm_devel	33m 0s
android-arm / arm_debug	22s
android-arm64 / arm64_devel	51m 33s
android-arm / arm_qa	33m 10s
android-arm64 / arm64_debug	20s
android-arm64 / arm64_qa	48m 14s
android-arm64 / arm64_gold	50m 42s
android-arm / arm_gold	42m 23s
android-cobalt-arm / arm_devel	31m 44s
android-cobalt-arm / arm_debug	23s
android-cobalt-arm / arm_qa	34m 1s
android-cobalt-arm / arm_gold	40m 25s
android-cobalt-arm64 / arm64_devel	51m 39s
android-cobalt-arm64 / arm64_debug	21s
android-cobalt-arm64 / arm64_qa	56m 25s
android-cobalt-arm64 / arm64_gold	50m 51s
android-x86 / x86_devel	34m 33s
android-x86 / x86_debug	19s
android-x86 / x86_qa	32m 11s
android-x86 / x86_gold	32m 25s
android-cobalt-x86 / x86_devel	42m 38s
android-cobalt-x86 / x86_debug	21s
android-cobalt-x86 / x86_qa	33m 54s
android-cobalt-x86 / x86_gold	43m 5s
	12h 52m 57s

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