ftrace: Remove empty declaration ftrace_enable_daemon() and ftrace_disable_daemon()

The definition of ftrace_enable_daemon() and ftrace_disable_daemon() has
been removed since commit cb7be3b ("ftrace: remove daemon"), remain
the declarations in the header files, so remove it.

Link: https://lore.kernel.org/linux-trace-kernel/[email protected]

Cc: <[email protected]>
Cc: <[email protected]>
Signed-off-by: Zhang Zekun <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

Author: Zhang Zekun

include/linux/ftrace.h

@@ -862,13 +862,8 @@ extern int skip_trace(unsigned long ip);
 extern void ftrace_module_init(struct module *mod);
 extern void ftrace_module_enable(struct module *mod);
 extern void ftrace_release_mod(struct module *mod);
-
-extern void ftrace_disable_daemon(void);
-extern void ftrace_enable_daemon(void);
 #else /* CONFIG_DYNAMIC_FTRACE */
 static inline int skip_trace(unsigned long ip) { return 0; }
-static inline void ftrace_disable_daemon(void) { }
-static inline void ftrace_enable_daemon(void) { }
 static inline void ftrace_module_init(struct module *mod) { }
 static inline void ftrace_module_enable(struct module *mod) { }
 static inline void ftrace_release_mod(struct module *mod) { }