perf beauty mmap: Print PROT_READ before PROT_EXEC to match strace output

Helps with comparing 'strace' and 'perf trace' output, for mutual
regression testing.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-va0qe95xbhep5hy52aq5qe0v@git.kernel.org


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>