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

Bug: 78793464
Test: compiles
Change-Id: I8e44ba77195a12fc2bac7d4276bbc4aa95149b31
diff --git a/libsparse/sparse_crc32.h b/libsparse/sparse_crc32.h
index e42c1eb..2702c4f 100644
--- a/libsparse/sparse_crc32.h
+++ b/libsparse/sparse_crc32.h
@@ -19,6 +19,6 @@
 
 #include <stdint.h>
 
-uint32_t sparse_crc32(uint32_t crc, const void *buf, size_t size);
+uint32_t sparse_crc32(uint32_t crc, const void* buf, size_t size);
 
 #endif