OWNERS: Add myself for schema review

Signing up to help review schema changes.

Change-Id: I14ea2c3cc184eee1c68d6d7deaabb0d218641809
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/OWNERS b/OWNERS
index 831357c..548e85c 100644
--- a/OWNERS
+++ b/OWNERS
@@ -54,6 +54,9 @@
 - partial_regex: test
   reviewers:
     - alexander.hansen@9elements.com
+- partial_regex: schemas
+  reviewers:
+    - alexander.hansen@9elements.com
 
 openbmc:
 - name: Ed Tanous