Update GN droid script

Splits the pushes into different lines since old adbs cannot handle the one
line command

TBR=mtklein@google.com

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2339293002

Review-Url: https://codereview.chromium.org/2339293002
1 file changed