Update checkstyle.xml to fit the latest update to the Google Style.
Update checkstyle.xml to fit the latest update to the Google Style.

Summary:
Formerly, the google style included grouping of google internal imports, separating imports between internal, third party and java/android framework classes. This is no longer a thing as of a month ago, more or less.

Re-indent file, too.

Reviewers: O5 Material Remixer!, markwei

Reviewed By: markwei

Tags: #material_remixer

Differential Revision: http://codereview.cc/D1532

material-foundation/material-remixer-android