Adjust Vulkan format feature support requirements

Fixes #258
diff --git a/external/vulkancts/modules/vulkan/api/vktApiFeatureInfo.cpp b/external/vulkancts/modules/vulkan/api/vktApiFeatureInfo.cpp
index fd006b6..9d92653 100644
--- a/external/vulkancts/modules/vulkan/api/vktApiFeatureInfo.cpp
+++ b/external/vulkancts/modules/vulkan/api/vktApiFeatureInfo.cpp
@@ -607,7 +607,6 @@
 	{
 		VK_FORMAT_B4G4R4A4_UNORM_PACK16,
 		VK_FORMAT_R5G6B5_UNORM_PACK16,
-		VK_FORMAT_R5G5B5A1_UNORM_PACK16,
 		VK_FORMAT_A1R5G5B5_UNORM_PACK16,
 		VK_FORMAT_R8_UNORM,
 		VK_FORMAT_R8_SNORM,
@@ -709,7 +708,6 @@
 		VK_FORMAT_A8B8G8R8_UINT_PACK32,
 		VK_FORMAT_A8B8G8R8_SINT_PACK32,
 		VK_FORMAT_A8B8G8R8_SRGB_PACK32,
-		VK_FORMAT_A2R10G10B10_UNORM_PACK32,
 		VK_FORMAT_A2B10G10R10_UNORM_PACK32,
 		VK_FORMAT_A2B10G10R10_UINT_PACK32,
 		VK_FORMAT_R16_UNORM,
@@ -754,7 +752,6 @@
 		VK_FORMAT_A8B8G8R8_SNORM_PACK32,
 		VK_FORMAT_A8B8G8R8_SRGB_PACK32,
 		VK_FORMAT_A2B10G10R10_UNORM_PACK32,
-		VK_FORMAT_A2R10G10B10_UNORM_PACK32,
 		VK_FORMAT_R16_UNORM,
 		VK_FORMAT_R16_SNORM,
 		VK_FORMAT_R16_SFLOAT,
@@ -814,12 +811,7 @@
 		VK_FORMAT_A8B8G8R8_SNORM_PACK32,
 		VK_FORMAT_A8B8G8R8_UINT_PACK32,
 		VK_FORMAT_A8B8G8R8_SINT_PACK32,
-		VK_FORMAT_A2R10G10B10_UNORM_PACK32,
-		VK_FORMAT_A2R10G10B10_SNORM_PACK32,
-		VK_FORMAT_A2R10G10B10_UINT_PACK32,
-		VK_FORMAT_A2R10G10B10_SINT_PACK32,
 		VK_FORMAT_A2B10G10R10_UNORM_PACK32,
-		VK_FORMAT_A2B10G10R10_UINT_PACK32,
 		VK_FORMAT_R16_UNORM,
 		VK_FORMAT_R16_SNORM,
 		VK_FORMAT_R16_UINT,