[LPC176x] Emergency Parser Feature (#10516)

Marlin/src/core/serial.h

@@ -44,23 +44,6 @@ enum DebugFlags : unsigned char {
   DEBUG_ALL           = 0xFF
 };
 
-#if ENABLED(EMERGENCY_PARSER)
-  enum e_parser_state : char {
-    state_RESET,
-    state_N,
-    state_M,
-    state_M1,
-    state_M10,
-    state_M108,
-    state_M11,
-    state_M112,
-    state_M4,
-    state_M41,
-    state_M410,
-    state_IGNORE // to '\n'
-  };
-#endif
-
 extern uint8_t marlin_debug_flags;
 #define DEBUGGING(F) (marlin_debug_flags & (DEBUG_## F))