tracing: Move __trace_buffer_{un}lock_*() functions to 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.

Move the __always_inline functions __trace_buffer_lock_reserve(),
__trace_buffer_unlock_commit() and trace_event_setup() into trace.h.

The trace.c file will be split up and these functions will be used in more
than one of these files. As they are already __always_inline they can
easily be moved into the trace.h header file.

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/20260208032449.813550600@kernel.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

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