Add add_slot_suffix function.

This function appends androidboot.slot_suffix to the
value of the argument.

Test: apply update
Bug: 153581609
Change-Id: I28a4047b5f2051acc039084f65a71deb492d9dcb
(cherry picked from commit dff80042750992ed635056cd9719481a14f93007)
Merged-In: I28a4047b5f2051acc039084f65a71deb492d9dcb
diff --git a/.clang-format b/.clang-format
index 4a3bd2f..6fa717c 100644
--- a/.clang-format
+++ b/.clang-format
@@ -36,6 +36,7 @@
 ColumnLimit: 100
 CommentPragmas: NOLINT:.*
 DerivePointerAlignment: false
+IncludeBlocks: Preserve
 IndentWidth: 2
 PointerAlignment: Left
 TabWidth: 2