target Android M for -arm- ASAN builds

Change-Id: I8154b9a0b2fcf76fa02af0efa6b57425c6f9ac31
Reviewed-on: https://skia-review.googlesource.com/101580
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
3 files changed