init: Adding support to import directories

Support added so init scripts can now import directories.

BUG: 22721249
Change-Id: I02b566bfb50ea84469f1ea0c6ad205435a1df286
TEST: Tested importing a folder on arm64 emulator
diff --git a/init/util.h b/init/util.h
index 3aba599..f08cb8d 100644
--- a/init/util.h
+++ b/init/util.h
@@ -64,4 +64,5 @@
 int restorecon(const char *pathname);
 int restorecon_recursive(const char *pathname);
 std::string bytes_to_hex(const uint8_t *bytes, size_t bytes_len);
+bool is_dir(const char* pathname);
 #endif