ibm: Add myself as a reviewer for meta-ibm kernel changes

Match on everything under meta-ibm/recipes-kernel.

Change-Id: I56a2b578d1cb05ab7a2f3be9bb434a695e57b4f3
Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/meta-ibm/OWNERS b/meta-ibm/OWNERS
index 7bb8379..275d006 100644
--- a/meta-ibm/OWNERS
+++ b/meta-ibm/OWNERS
@@ -1,2 +1,7 @@
 owners:
 - geissonator@yahoo.com
+
+matchers:
+- exact: recipes-kernel
+  reviewers:
+  - joel@jms.id.au