ANDROID: README: fix 'cherry picked from' instructions

The instructions in the README should match what `git cherry-pick -x` is
producing to get a consistent format that we can later rely on.

Fixes: f8978f4f ("ANDROID: add README.md")
Change-Id: I7c9f06af65654ae141ef85b52a081641c7320348
Cc: Saravana Kannan <saravanak@google.com>
Signed-off-by: Matthias Maennich <maennich@google.com>