ftrace.c: Add #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

- Remove prefixes from pr_<level>, use pr_fmt(fmt).

No change in output.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <9b377eefae9e28c599dd4a17bdc81172965e9931.1254701151.git.joe@perches.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>