vulkan: move GetDeviceQueue_Bottom

Move it from loader.cpp to driver.cpp and rename it to
driver::GetDeviceQueue.  No functional change.

Change-Id: Ide8ebe044e62b8ef6fc64ac03dcc1d920f5bf9a6
diff --git a/vulkan/libvulkan/driver.h b/vulkan/libvulkan/driver.h
index 7af63fa..8569a52 100644
--- a/vulkan/libvulkan/driver.h
+++ b/vulkan/libvulkan/driver.h
@@ -108,6 +108,8 @@
 VKAPI_ATTR PFN_vkVoidFunction GetInstanceProcAddr(VkInstance instance, const char* pName);
 VKAPI_ATTR PFN_vkVoidFunction GetDeviceProcAddr(VkDevice device, const char* pName);
 VKAPI_ATTR VkResult EnumerateInstanceExtensionProperties(const char* pLayerName, uint32_t* pPropertyCount, VkExtensionProperties* pProperties);
+
+VKAPI_ATTR void GetDeviceQueue(VkDevice device, uint32_t queueFamilyIndex, uint32_t queueIndex, VkQueue* pQueue);
 // clang-format on
 
 template <typename DispatchableType>