Add missing required extension in pageable allocation tests

Extension VK_EXT_pageable_device_local_memory requires
VK_EXT_memory_priority

Components: Vulkan

VK-GL-CTS issue: 3783

Affects:
dEQP-VK.memory.pageable_allocation.*

Change-Id: Ib29a5d908549d64342dc186c19ce533dec953d3f
diff --git a/external/vulkancts/modules/vulkan/memory/vktMemoryAllocationTests.cpp b/external/vulkancts/modules/vulkan/memory/vktMemoryAllocationTests.cpp
index 7bd983b..4d28212 100644
--- a/external/vulkancts/modules/vulkan/memory/vktMemoryAllocationTests.cpp
+++ b/external/vulkancts/modules/vulkan/memory/vktMemoryAllocationTests.cpp
@@ -213,7 +213,10 @@
 
 	std::vector<const char*>						deviceExtensions;
 	if (usePageable)
+	{
+		deviceExtensions.push_back("VK_EXT_memory_priority");
 		deviceExtensions.push_back("VK_EXT_pageable_device_local_memory");
+	}
 
 	VkDeviceQueueCreateInfo							queueInfo		=
 	{