yuzu-qt: Load Vulkan device info at startup

Loading it when the configuration opens now incurs a noticeable delay.
We also don't need to rediscover the same data repeatedly each time the
configuration opens.

Moves vulkan device info discovery to yuzu's startup as opposed to the
configure_graphics constructor.

src/yuzu/CMakeLists.txt

@@ -210,6 +210,8 @@ add_executable(yuzu
     util/url_request_interceptor.h
     util/util.cpp
     util/util.h
+    vk_device_info.cpp
+    vk_device_info.h
     compatdb.cpp
     compatdb.h
     yuzu.qrc