powerpc: Only support DYNAMIC_FTRACE not static

We've had dynamic ftrace support for over 9 years since Steve first
wrote it, all the distros use dynamic, and static is basically
untested these days, so drop support for static ftrace.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/trace/ftrace.c

@@ -662,7 +662,6 @@ int __init ftrace_dyn_arch_init(void)
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 
-#ifdef CONFIG_DYNAMIC_FTRACE
 extern void ftrace_graph_call(void);
 extern void ftrace_graph_stub(void);
 
@@ -691,7 +690,6 @@ int ftrace_disable_ftrace_graph_caller(void)
 
 	return ftrace_modify_code(ip, old, new);
 }
-#endif /* CONFIG_DYNAMIC_FTRACE */
 
 /*
  * Hook the return address and push it in the stack of return addrs