add geissonator as maintainer to meta-phosphor

I've been utilizing my gerrit admin abilities to merge autobumps and
backup Brad in meta-phosphor. The OWNERS plugin disabled this
path for me. My intention is to keep with this same workflow. I'll merge
autobumps and backup Brad as needed.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I315ecda88d16d7698d929e64a8d55db88906a50f
diff --git a/meta-phosphor/OWNERS b/meta-phosphor/OWNERS
index 15c6c2d..f792229 100644
--- a/meta-phosphor/OWNERS
+++ b/meta-phosphor/OWNERS
@@ -1,2 +1,3 @@
 owners:
 - bradleyb@fuzziesquirrel.com
+- geissonator@yahoo.com