Split android-style.xml into modules for checkstyle.

This will allow teams to reuse parts of checkstyle without having
to worry about missing any checks when they change in the main configs.

Bug: None
Test: Tested locally and checkstyle still verifies the same rules using android-style.xml
Change-Id: I91ca11d3d7089db656bc640549bd7012284a8859
5 files changed