texture_cache_base: Remove unused function declarations

src/video_core/texture_cache/texture_cache_base.h

@@ -144,14 +144,6 @@ public:
                    const Tegra::Engines::Fermi2D::Surface& src,
                    const Tegra::Engines::Fermi2D::Config& copy);
 
-    /// Invalidate the contents of the color buffer index
-    /// These contents become unspecified, the cache can assume aggressive optimizations.
-    void InvalidateColorBuffer(size_t index);
-
-    /// Invalidate the contents of the depth buffer
-    /// These contents become unspecified, the cache can assume aggressive optimizations.
-    void InvalidateDepthBuffer();
-
     /// Try to find a cached image view in the given CPU address
     [[nodiscard]] ImageView* TryFindFramebufferImageView(VAddr cpu_addr);