LinearDiskCache: Don't cast away const in Read()

We really shouldn't make the out pointer in the read function const and
then summarily cast it away. Also alters Write to be consistent with
casting.

Source/Core/Common/LinearDiskCache.h

@@ -163,13 +163,13 @@ private:
   template <typename D>
   bool Write(const D* data, u32 count = 1)
   {
-    return m_file.write((const char*)data, count * sizeof(D)).good();
+    return m_file.write(reinterpret_cast<const char*>(data), count * sizeof(D)).good();
   }
 
   template <typename D>
-  bool Read(const D* data, u32 count = 1)
+  bool Read(D* data, u32 count = 1)
   {
-    return m_file.read((char*)data, count * sizeof(D)).good();
+    return m_file.read(reinterpret_cast<char*>(data), count * sizeof(D)).good();
   }
 
   struct Header