Use the 2 space clang format for libunwindstack.

Test: NA
Change-Id: Ibf321931d1e7ac5bbe4e8479c9d706576f55e8ac
diff --git a/libunwindstack/.clang-format b/libunwindstack/.clang-format
new file mode 120000
index 0000000..fd0645f
--- /dev/null
+++ b/libunwindstack/.clang-format
@@ -0,0 +1 @@
+../.clang-format-2
\ No newline at end of file