tracing: clean up tracepoints kconfig structure

do not expose users to CONFIG_TRACEPOINTS - tracers can select it
just fine.

update ftrace to select CONFIG_TRACEPOINTS.
Signed-off-by: Ingo Molnar <mingo@elte.hu>

init/Kconfig

@@ -771,11 +771,12 @@ config PROFILING
 	  Say Y here to enable the extended profiling support mechanisms used
 	  by profilers such as OProfile.
 
+#
+# Place an empty function call at each tracepoint site. Can be
+# dynamically changed for a probe function.
+#
 config TRACEPOINTS
-	bool "Activate tracepoints"
-	help
-	  Place an empty function call at each tracepoint site. Can be
-	  dynamically changed for a probe function.
+	bool
 
 config MARKERS
 	bool "Activate markers"

kernel/trace/Kconfig

@@ -14,6 +14,7 @@ config TRACING
 	bool
 	select DEBUG_FS
 	select STACKTRACE
+	select TRACEPOINTS
 
 config FTRACE
 	bool "Kernel Function Tracer"