Revert "Oprofile Multiplexing Patch"

Reverting commit 1a960b402a for the main
branch. Multiplexing will be tracked on a separate feature branch.

Conflicts:

    arch/x86/oprofile/nmi_int.c

arch/x86/oprofile/op_counter.h

@@ -10,14 +10,13 @@
 #ifndef OP_COUNTER_H
 #define OP_COUNTER_H
  
-#define OP_MAX_COUNTER 32
+#define OP_MAX_COUNTER 8
  
 /* Per-perfctr configuration as set via
  * oprofilefs.
  */
 struct op_counter_config {
         unsigned long count;
-		unsigned long save_count_low;
         unsigned long enabled;
         unsigned long event;
         unsigned long kernel;