Use build123-a1 for Android N5 bot
Use build123-a1 for Android N5 bot

BUG=341964,477777
TBR=navabi@chromium.org

Review URL: https://codereview.chromium.org/1089773004

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@294862 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build