stm class: ftrace: Change dependency to TRACING

We will support copying event trace to STM. Change
STM_SOURCE_FTRACE to depend on TRACING since we will
support multiple tracers.
Reviewed-by: NSteven Rostedt (VMware) <rostedt@goodmis.org>
Reviewed-by: NAlexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: NTingwei Zhang <tingwei@codeaurora.org>
Signed-off-by: NAlexander Shishkin <alexander.shishkin@linux.intel.com>
Link: https://lore.kernel.org/r/20201005071319.78508-2-alexander.shishkin@linux.intel.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hwtracing/stm/Kconfig

@@ -71,7 +71,7 @@ config STM_SOURCE_HEARTBEAT
 
 config STM_SOURCE_FTRACE
 	tristate "Copy the output from kernel Ftrace to STM engine"
-	depends on FUNCTION_TRACER
+	depends on TRACING
 	help
 	  This option can be used to copy the output from kernel Ftrace
 	  to STM engine. Enabling this option will introduce a slight