perf maps: Hide maps internals

Move the struct into the C file. Add maps__equal to work around
exposing the struct for reference count checking. Add accessors for
the unwind_libunwind_ops. Move maps_list_node to its only use in
symbol.c.

Signed-off-by: Ian Rogers <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: K Prateek Nayak <[email protected]>
Cc: James Clark <[email protected]>
Cc: Vincent Whitchurch <[email protected]>
Cc: Alexey Dobriyan <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Changbin Du <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Song Liu <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: Liam Howlett <[email protected]>
Cc: Artem Savkov <[email protected]>
Cc: [email protected]
Signed-off-by: Namhyung Kim <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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