Remove .gitattributes file that tries to configure git-lfs

We don't support git-lfs in the Android tree, and this is causing `repo sync` to fail for users that do not have git-lfs installed.

Bug: 157703216
Test: treehugger
Change-Id: I6ed4ca1ba8910b6d8cc1c18bebbb1a67dc810455
1 file changed