perf top: Use __map__is_kernel()

Shorter form to figure out if a given map is the kernel one and also
reduces the number of code accessing MAP__{FUNCTION,VARIABLE}, that
should go away at some point.

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

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