VideoCommon: Expose SamplerState to shaders

The benefit to exposing this over the raw BP state is that adjustments Dolphin makes, such as LOD biases from arbitrary mipmap detection, will work properly.

Source/Core/VideoCommon/PixelShaderManager.h

@@ -30,6 +30,7 @@ public:
   static void SetAlphaTestChanged();
   static void SetDestAlphaChanged();
   static void SetTexDims(int texmapid, u32 width, u32 height);
+  static void SetSamplerState(int texmapid, u32 tm0, u32 tm1);
   static void SetZTextureBias();
   static void SetViewportChanged();
   static void SetEfbScaleChanged(float scalex, float scaley);