ftrace: Use the ftrace_addr helper functions to find the ftrace_addr

With the moving of the functions that determine what the mcount call site
should be replaced with into the generic code, there is a few places
in the generic code that can use them instead of hard coding it as it
does.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --cc kernel/trace/ftrace.c
Simple merge