siemens,am33x,thuban: rename dxr2 to thuban

Update new naming scheme.

Signed-off-by: Samuel Egli <samuel.egli@siemens.com>
Acked-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/siemens/draco/MAINTAINERS b/board/siemens/draco/MAINTAINERS
index 6d9544a..484dd73 100644
--- a/board/siemens/draco/MAINTAINERS
+++ b/board/siemens/draco/MAINTAINERS
@@ -4,7 +4,7 @@
 F:	board/siemens/draco/
 F:	include/configs/draco.h
 F:	configs/draco_defconfig
-F:	include/configs/dxr2.h
-F:	configs/dxr2_defconfig
+F:	include/configs/thuban.h
+F:	configs/thuban_defconfig
 F:	include/configs/rastaban.h
 F:	configs/rastaban_defconfig