libsparse: Add .clang-format and reformat to google3 style

Bug: 78793464
Test: compiles
Change-Id: I8e44ba77195a12fc2bac7d4276bbc4aa95149b31
diff --git a/libsparse/sparse_file.h b/libsparse/sparse_file.h
index 763f43f..e565f63 100644
--- a/libsparse/sparse_file.h
+++ b/libsparse/sparse_file.h
@@ -24,12 +24,12 @@
 #include <sparse/sparse.h>
 
 struct sparse_file {
-	unsigned int block_size;
-	int64_t len;
-	bool verbose;
+  unsigned int block_size;
+  int64_t len;
+  bool verbose;
 
-	struct backed_block_list *backed_block_list;
-	struct output_file *out;
+  struct backed_block_list* backed_block_list;
+  struct output_file* out;
 };
 
 #ifdef __cplusplus