clang-format: Add IncludeBlocks: Preserve

Test: pass
Change-Id: Id8394cccb9652c4252e9e4eacfe8096d709ccc1c
diff --git a/.clang-format b/.clang-format
index 03af56d..6725a1f 100644
--- a/.clang-format
+++ b/.clang-format
@@ -11,3 +11,4 @@
 IndentWidth: 4
 PenaltyBreakBeforeFirstCallParameter: 100000
 SpacesBeforeTrailingComments: 1
+IncludeBlocks: Preserve