Remove enh from OWNERS.

I'm happy to be added as a reviewer for random questions, but it
probably doesn't make sense for me to be the alphabetically first
suggestion if you try gerrit's "SUGGEST OWNERS" button...

Test: N/A
Change-Id: Ia6f672d782be2bbae37285fb691eef57b17132d6
diff --git a/OWNERS b/OWNERS
index 0e289d6..45c72e3 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,6 +1,4 @@
 elsk@google.com
-enh@google.com
 nhdo@google.com
 xunchang@google.com
 zhangkelvin@google.com
-