vboot: Add .clang-format file

Copied from depthcharge.

BUG=none
BRANCH=none
TEST=formatted some code

Change-Id: I9b9916df7da6195c753f2ce9ddbf37baf8a3e747
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1160930
Reviewed-by: Martin Roth <martinroth@chromium.org>

.clang-format

@@ -0,0 +1,10 @@
+BasedOnStyle:                              LLVM
+Language:                                  Cpp
+IndentWidth:                               8
+UseTab:                                    Always
+BreakBeforeBraces:                         Linux
+AllowShortIfStatementsOnASingleLine:       false
+IndentCaseLabels:                          false
+SortIncludes:                              false
+ContinuationIndentWidth:                   8
+ColumnLimit:                               80