meta-aspeed: Document myself as maintainer

Change-Id: I318336b713b9f357b0dda11e391d5176bceb24b9
Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/MAINTAINERS b/MAINTAINERS
index 9b799c2..453d5e4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -46,3 +46,4 @@
 # @openbmc and is synced by the maintainer using git-subtree. Please submit
 # changes against @openbmc.
 M:  Brad Bishop <bradleyb@fuzziesquirrel.com> <radsquirrel!>
+M:  Joel Stanley <joel@jms.id.au> <shenki!>