Skip GenericBootImageTest on 32-bit ARM devices. GKI and generic boot image requirements are not enforced on 32-bit ARM devices. Keep the test running on x86 and x86_64 even though the requirement is not in place so that the test is kept green on virtual devices. Test: builds Bug: 237022520 Change-Id: I7f8dfb5d5c7f32129c350fec3f578f668fb166a7