Separate oat from image

Change-Id: If2abdb99826ead14e3465d90ba2acffd89709389
diff --git a/src/image.cc b/src/image.cc
index 5bf7b10..c610c8a 100644
--- a/src/image.cc
+++ b/src/image.cc
@@ -4,7 +4,7 @@
 
 namespace art {
 
-const byte ImageHeader::kImageMagic[] = { 'o', 'a', 't', '\n' };
+const byte ImageHeader::kImageMagic[] = { 'a', 'r', 't', '\n' };
 const byte ImageHeader::kImageVersion[] = { '0', '0', '1', '\0' };
 
 }  // namespace art