Consolidate PrintCounter

Marlin/src/Marlin.h

@@ -32,12 +32,6 @@
   #include "gcode/parser.h"
 #endif
 
-#if ENABLED(PRINTCOUNTER)
-  #include "module/printcounter.h"
-#else
-  #include "libs/stopwatch.h"
-#endif
-
 void stop();
 
 void idle(
@@ -234,13 +228,6 @@ extern volatile bool wait_for_heatup;
   extern int lpq_len;
 #endif
 
-// Print job timer
-#if ENABLED(PRINTCOUNTER)
-  extern PrintCounter print_job_timer;
-#else
-  extern Stopwatch print_job_timer;
-#endif
-
 #if ENABLED(MIXING_EXTRUDER)
   extern float mixing_factor[MIXING_STEPPERS];
   #if MIXING_VIRTUAL_TOOLS > 1