adb: add 100 column limit to .clang-format.

Change-Id: I7d96a6d505d2ddd92ffe7ad12ffc777c03c63caf
diff --git a/.clang-format b/.clang-format
index 0395c8e..6737535 100644
--- a/.clang-format
+++ b/.clang-format
@@ -2,6 +2,7 @@
 AllowShortBlocksOnASingleLine: false
 AllowShortFunctionsOnASingleLine: false
 
+ColumnLimit: 100
 CommentPragmas: NOLINT:.*
 DerivePointerAlignment: false
 IndentWidth: 4