tracing: Move ftrace_trace_stack() out of trace.c and into trace.h

The file trace.c has become a catchall for most things tracing. Start
making it smaller by breaking out various aspects into their own files.

Make ftrace_trace_stack() into a static inline that tests if stack tracing
is enabled and if so to call __ftrace_trace_stack() to do the stack trace.
This keeps the test inlined in the fast paths and only does the function
call if stack tracing is enabled.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://patch.msgid.link/20260208032449.974218132@kernel.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

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