Add natsu@ to cuttlefish_kernel owners

Also alphabetize owners.

Test: n/a
Change-Id: I5dc6cb5fabcf4b9b6b5a17b44d92bcd7a264a1d2
diff --git a/OWNERS b/OWNERS
index 38c5ec7..9594320 100644
--- a/OWNERS
+++ b/OWNERS
@@ -3,5 +3,6 @@
 jemoreira@google.com
 malchev@google.com
 muntsinger@google.com
-schuffelen@google.com
+natsu@google.com
 rammuthiah@google.com
+schuffelen@google.com