arm: kirkwood: openrd: Mark openrd boards as maintained again

With the latest size increase of the openrd boards, they all compile
clean again. Let's mark them as maintained again and add the Travis
job.

Please note that I can only compile-test these targets as I don't
have access to one of those boards.
Signed-off-by: NStefan Roese <sr@denx.de>
Cc: Albert ARIBAUD <albert-u-boot@aribaud.net>
Cc: Vagrant Cascadian <vagrant@debian.org>
Cc: Chris Packham <judge.packham@gmail.com>
Cc: Tom Rini <trini@konsulko.com>

.travis.yml

@@ -235,9 +235,9 @@ matrix:
       env:
         - BUILDMAN="sandbox x86"
           TOOLCHAIN="i386"
-    - name: "buildman kirkwood (excluding openrd)"
+    - name: "buildman kirkwood"
       env:
-        - BUILDMAN="kirkwood -x openrd"
+        - BUILDMAN="kirkwood"
     - name: "buildman mvebu"
       env:
         - BUILDMAN="mvebu"

board/Marvell/openrd/MAINTAINERS

 OPENRD / OPENRD_CLIENT BOARD
-#M:	Albert ARIBAUD <albert-u-boot@aribaud.net>
-S:	Orphaned (Since 2018-09)
+M:	Stefan Roese <sr@denx.de>
+S:	Maintained
 F:	board/Marvell/openrd/
 F:	include/configs/openrd.h
 F:	configs/openrd_base_defconfig