VkPhysicalDeviceFeatures::imageCubeArray implies both the ImageCubeArray
and SampledCubeArray SPIRV capabilities are supported. We had only
accepted SampledCubeArray so far.

Bug: b/144988970
Change-Id: I93fb93a95047f73c677de38757660ea1321a4654
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/39289Tested-by: Chris Forbes <chrisforbes@google.com>
Presubmit-Ready: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>