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/openrd.h b/board/Marvell/openrd/openrd.h
new file mode 100644
index 0000000..56dfeea
--- /dev/null
+++ b/board/Marvell/openrd/openrd.h
@@ -0,0 +1,30 @@
+/*
+ * (C) Copyright 2009
+ * Net Insight <www.netinsight.net>
+ * Written-by: Simon Kagstrom <simon.kagstrom@netinsight.net>
+ *
+ * Based on sheevaplug.h:
+ * (C) Copyright 2009
+ * Marvell Semiconductor <www.marvell.com>
+ * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __OPENRD_BASE_H
+#define __OPENRD_BASE_H
+
+#define OPENRD_OE_LOW		(~(1<<28))        /* RS232 / RS485 */
+#define OPENRD_OE_HIGH		(~(1<<2))         /* SD / UART1 */
+#define OPENRD_OE_VAL_LOW		(0)       /* Sel RS232 */
+#define OPENRD_OE_VAL_HIGH		(1 << 2)  /* Sel SD */
+
+/* PHY related */
+#define MV88E1116_LED_FCTRL_REG		10
+#define MV88E1116_CPRSP_CR3_REG		21
+#define MV88E1116_MAC_CTRL_REG		21
+#define MV88E1116_PGADR_REG		22
+#define MV88E1116_RGMII_TXTM_CTRL	(1 << 4)
+#define MV88E1116_RGMII_RXTM_CTRL	(1 << 5)
+
+#endif /* __OPENRD_BASE_H */