Bump to 8.20 for weekly

Change-Id: I99bfb9c9ca8bf07a2e0483a8634889e8b2ddea65
Signed-off-by: Josue Rivera <prbassplayer@gmail.com>
Add chromium_prebuilt.sh
Add Sony Xperia T (mint)
Add Sony Xperia V (tsubasa)