cgtqmx6eval: Add a maintainer entry

Add me as the board maintainer and move the status to 'Maintained'.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>

board/congatec/cgtqmx6eval/MAINTAINERS

@@ -1,6 +1,6 @@
 CGTQMX6EVAL BOARD
-#M:	Leo Sartre <lsartre@adeneo-embedded.com>
-S:	Orphan (since 2014-06)
+M:	Otavio Salvador <otavio@ossystems.com.br>
+S:	Maintained
 F:	board/congatec/cgtqmx6eval/
 F:	include/configs/cgtqmx6eval.h
 F:	configs/cgtqmx6qeval_defconfig