vk_sampler_cache: Remove unused includes

These are no longer used within this header, so they can be removed.

src/video_core/renderer_vulkan/vk_sampler_cache.h

@@ -4,9 +4,6 @@
 
 #pragma once
 
-#include <unordered_map>
-
-#include "common/common_types.h"
 #include "video_core/renderer_vulkan/declarations.h"
 #include "video_core/sampler_cache.h"
 #include "video_core/textures/texture.h"