ftrace: Reverse what the RECURSION flag means in the ftrace_ops

Now that all callbacks are recursion safe, reverse the meaning of the
RECURSION flag and rename it from RECURSION_SAFE to simply RECURSION.
Now only callbacks that request to have recursion protecting it will
have the added trampoline to do so.

Also remove the outdated comment about "PER_CPU" when determining to
use the ftrace_ops_assist_func.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]

Cc: Peter Zijlstra <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Josh  Poimboeuf <[email protected]>
Cc: Jiri Kosina <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Sebastian Andrzej Siewior <[email protected]>
Cc: Miroslav Benes <[email protected]>
Cc: Kamalesh Babulal <[email protected]>
Cc: Petr Mladek <[email protected]>
Cc: [email protected]
Signed-off-by: Steven Rostedt (VMware) <[email protected]>

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