oprofile: update comment for oprofile_add_sample()

The cpu argument is no longer part of the parameter list.
Signed-off-by: NRobert Richter <robert.richter@amd.com>

include/linux/oprofile.h

@@ -86,8 +86,7 @@ int oprofile_arch_init(struct oprofile_operations * ops);
 void oprofile_arch_exit(void);
 
 /**
- * Add a sample. This may be called from any context. Pass
- * smp_processor_id() as cpu.
+ * Add a sample. This may be called from any context.
  */
 void oprofile_add_sample(struct pt_regs * const regs, unsigned long event);