MAINTAINERS: add reviewers for OpenBMC machines

Add reviewers to OpenBMC machines as suggested by Andrew:
https://lists.ozlabs.org/pipermail/openbmc/2017-October/009540.html

Change-Id: Ib8cf8cf219e36dc53bb2cca1d0d6c144acc82da7
Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 58ef7bb..f37c155 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -116,7 +116,31 @@
 
 @openbmc://*
 R:  Brad Bishop <bradleyb@fuzziesquirrel.com> <radsquirrel!>
-R:  Patrick Williams <patrick@stwcx.xyz> <stwcx!>
+
+@openbmc://meta-evb/meta-evb-raspberrypi/*
+R:  Yi TZ Li <shliyi@cn.ibm.com> # TODO: MISSING IRC HANDLE
+
+@openbmc://meta-evb/meta-evb-aspeed/meta-evb-ast2500/*
+R:  Joel Stanley <joel@jms.id.au> <shenki!>
+
+@openbmc://meta-x86/meta-mellanox/meta-msn/*
+R:  Mykola Kostenok <c_mykolak@mellanox.com> # TODO: MISSING IRC HANDLE
+
+@openbmc://meta-x86/meta-quanta/meta-q71l/*
+R:  Patrick Venture <venture@google.com> <venture!>
+
+@openbmc://meta-openpower/meta-ingrasys/meta-zaius/*
+R:  Xo Wang <xow@google.com> <GHF!>
+
+@openbmc://meta-openpower/meta-ibm/meta-firestone/*
+R:  Lei YU <mine260309@gmail.com> # TODO: MISSING IRC HANDLE
+
+@openbmc://meta-openpower/meta-ibm/meta-romulus/*
+R:  Lei YU <mine260309@gmail.com> # TODO: MISSING IRC HANDLE
+
+@openbmc://meta-openpower/meta-ibm/meta-witherspoon/*
+R:  Brad Bishop <bradleyb@fuzziesquirrel.com> <radsquirrel!>
+R:  Andrew Geissler <andrewg@us.ibm.com> <andrewg!>
 
 @openpower-host-ipmi-oem://*
 R:  Tom Joseph <tomjoseph@in.ibm.com> <tomjose!>