Revive OpenRD targets

Revert commit 7a2c1b13 which dropped OpenRD boards.
Assume maintainership of OpenRD.
Remove OpenRD from scrapyard.
Switch OpenRD to generic board.
Switch to Thumb build.

Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
diff --git a/board/Marvell/openrd/MAINTAINERS b/board/Marvell/openrd/MAINTAINERS
new file mode 100644
index 0000000..3789a04
--- /dev/null
+++ b/board/Marvell/openrd/MAINTAINERS
@@ -0,0 +1,12 @@
+OPENRD BOARD
+M:	Albert ARIBAUD <albert-u-boot@aribaud.net>
+S:	Maintained
+F:	board/Marvell/openrd/
+F:	include/configs/openrd.h
+F:	configs/openrd_base_defconfig
+
+OPENRD_CLIENT BOARD
+M:	Albert ARIBAUD <albert-u-boot@aribaud.net>
+S:	Maintained
+F:	configs/openrd_client_defconfig
+F:	configs/openrd_ultimate_defconfig