Add a PREUPLOAD.cfg file to enable clang-format

This will save some time on reviews. This also preemptively formats some
stuff so that future developers don't have to fight against it.

Bug: None
Test: pre-upload.py complained when I introduced a badly formatted
      change.

Change-Id: I75b38cebc1298e481e62dbc9cea72f39ce33f88f
diff --git a/.clang-format b/.clang-format
index a3ef233..9320a7a 100644
--- a/.clang-format
+++ b/.clang-format
@@ -3,4 +3,5 @@
 UseTab: Always
 BreakBeforeBraces: Linux
 AllowShortIfStatementsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: false
 IndentCaseLabels: false