tracing: switch function prints from %pf to %ps

For direct function pointers (like what mcount provides) PowerPC64
requires the use of %ps, otherwise nothing is printed.

This patch converts all prints of functions retrieved through mcount
to use the %ps format from the %pf.

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

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

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

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