perf map_groups: Introduce for_each_entry() and for_each_entry_safe() iterators

To reduce boilerplate, providing a more compact form to iterate over the
maps in a map_group.

Cc: Adrian Hunter <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Link: https://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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