ftrace: rename trace_unlikely.c file

Impact: File name change of trace_unlikely.c

The "unlikely" name for the tracer is quite ugly. We renamed all the
parts of it to "branch" and now it is time to rename the file too.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/trace/Makefile

@@ -30,6 +30,6 @@ obj-$(CONFIG_STACK_TRACER) += trace_stack.o
 obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
 obj-$(CONFIG_BOOT_TRACER) += trace_boot.o
 obj-$(CONFIG_FUNCTION_RET_TRACER) += trace_functions_return.o
-obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_unlikely.o
+obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
 
 libftrace-y := ftrace.o