DSPAnalyzer: Make CodeFlags private to the analyzer

Now that we have the convenience functions around the flag
bit manipulations, there's no external usages of the flags, so we can
make these private to the analyzer implementation.

Now the Analyzer namespace is largely unnecessary and can be merged with
the DSP namespace in the next commit.

Source/Core/Core/DSP/DSPAnalyzer.h

@@ -18,17 +18,6 @@ namespace DSP::Analyzer
 // Useful things to detect:
 // * Loop endpoints - so that we can avoid checking for loops every cycle.
 
-enum CodeFlags : u8
-{
-  CODE_NONE = 0,
-  CODE_START_OF_INST = 1,
-  CODE_IDLE_SKIP = 2,
-  CODE_LOOP_START = 4,
-  CODE_LOOP_END = 8,
-  CODE_UPDATE_SR = 16,
-  CODE_CHECK_EXC = 32,
-};
-
 class Analyzer
 {
 public:
@@ -86,6 +75,17 @@ public:
   }
 
 private:
+  enum CodeFlags : u8
+  {
+    CODE_NONE = 0,
+    CODE_START_OF_INST = 1,
+    CODE_IDLE_SKIP = 2,
+    CODE_LOOP_START = 4,
+    CODE_LOOP_END = 8,
+    CODE_UPDATE_SR = 16,
+    CODE_CHECK_EXC = 32,
+  };
+
   // Flushes all analyzed state.
   void Reset();