board: tq: fix spelling of "TQ-Systems"

"TQ-Systems" is written with a dash.

Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
diff --git a/board/tq/tqma6/MAINTAINERS b/board/tq/tqma6/MAINTAINERS
index dae719f..c4fb6ec 100644
--- a/board/tq/tqma6/MAINTAINERS
+++ b/board/tq/tqma6/MAINTAINERS
@@ -1,4 +1,4 @@
-TQ SYSTEMS TQMA6 BOARD
+TQ-SYSTEMS TQMA6 BOARD
 M:	Markus Niebel <Markus.Niebel@tq-group.com>
 S:	Maintained
 F:	board/tq/tqma6/