Export normalize_arch() function, so other part of perf can get
normalized form of arch string.
Signed-off-by: He Kuang
Acked-by: Jiri Olsa
Cc: Adrian Hunter
Cc: Alexander Shishkin
Cc: Andi Kleen
Cc: David Ahern
Cc: Ekaterina Tumanova
Cc: Josh Poimboeuf
Cc: Kan Liang
Cc: Masami Hiramatsu
Cc: Namhyung Kim
Cc: Pekka Enberg
Cc: Peter Zijlstra
Cc: Stephane Eranian
Cc: Sukadev Bhattiprolu
Cc: Wang Nan
Link: http://lkml.kernel.org/r/1464924803-22214-10-git-send-email-hekuang@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo