oprofile: moving cpu_buffer_reset() to cpu_buffer.h

This is in preparation for changes in the cpu buffer implementation.

Signed-off-by: Robert Richter <robert.richter@amd.com>

drivers/oprofile/buffer_sync.c

@@ -548,6 +548,7 @@ void sync_buffer(int cpu)
 
 	/* Remember, only we can modify tail_pos */
 
+	cpu_buffer_reset(cpu);
 #ifndef CONFIG_OPROFILE_IBS
 	available = cpu_buffer_entries(cpu_buf);