CTS: check for AHB support if needed in the Vulkan tests

In Q, for devices using SwiftShader Vulkan, they are not required to
support AHB. So in the tests, we need to check if AHB is supported
before enabling the device extensions, since the real test against AHB
support is done in VulkanFeaturesTest.

Bug: 160163594
Test: BasicVulkanGpuTest
Test: CameraVulkanGpuTest
Test: MediaVulkanGpuTest

Change-Id: Ia93234072ba8894f63ce29e2c4c81eaf177833f5
1 file changed