Revert CUBE_COMPATIBLE flag check from "Fix required sample count tests"

Spec does not say CUBE_COMPATIBLE flag forces
vkGetPhysicalDeviceImageFormatProperties to return sample count equal
to 1, so the flag should be irrelevant for sample count check.

Fixes #440
This partially reverts 8753a9e7528ca67b25bfabb4f03915a25721a690.

Change-Id: Ic4005cb0a651f433ff421eab671fb013561c78c4
diff --git a/external/vulkancts/modules/vulkan/api/vktApiFeatureInfo.cpp b/external/vulkancts/modules/vulkan/api/vktApiFeatureInfo.cpp
index f3f441c..1ba05ef 100644
--- a/external/vulkancts/modules/vulkan/api/vktApiFeatureInfo.cpp
+++ b/external/vulkancts/modules/vulkan/api/vktApiFeatureInfo.cpp
@@ -1740,7 +1740,7 @@
 				results.check(imageType != VK_IMAGE_TYPE_3D || (properties.maxExtent.width >= 1 && properties.maxExtent.height >= 1 && properties.maxExtent.depth >= 1), "Invalid dimensions for 3D image");
 				results.check(imageType != VK_IMAGE_TYPE_3D || properties.maxArrayLayers == 1, "Invalid maxArrayLayers for 3D image");
 
-				if (tiling == VK_IMAGE_TILING_OPTIMAL && imageType == VK_IMAGE_TYPE_2D && !(curCreateFlags & VK_IMAGE_CREATE_CUBE_COMPATIBLE_BIT) &&
+				if (tiling == VK_IMAGE_TILING_OPTIMAL && imageType == VK_IMAGE_TYPE_2D &&
 					 ((supportedFeatures & (VK_FORMAT_FEATURE_DEPTH_STENCIL_ATTACHMENT_BIT | VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BIT)) ||
 					 ((supportedFeatures & VK_FORMAT_FEATURE_STORAGE_IMAGE_BIT) && deviceFeatures.shaderStorageImageMultisample)))
 				{