OWNERS: allow yaml to also review gen

If changes to YAML files also induce gen/* changes, the same
owner should be able to review those.  Adding Matt to be able
to review gen.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Iedbfc193df75cf7b70c282de3a14498e04070920
diff --git a/OWNERS b/OWNERS
index d2db0ab..8f293c1 100644
--- a/OWNERS
+++ b/OWNERS
@@ -41,6 +41,9 @@
 - partial_regex: yaml/com/ibm
   owners:
   - spinler@us.ibm.com
+- partial_regex: gen/com/ibm
+  owners:
+  - spinler@us.ibm.com
 
 openbmc:
 - name: Deepak Kodihalli