perf unwind: Use 'struct map_symbol' in 'struct unwind_entry'

To help in passing that info around to callchain routines that, for the
same reason, are moving to use 'struct map_symbol'.

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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