imx: boards: Add maintainers info

Add MAINTAINERS info for mx6slevk_spl, mx6ul_9x9_evk and mx6qpsabreauto.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/board/freescale/mx6slevk/MAINTAINERS b/board/freescale/mx6slevk/MAINTAINERS
index 18d31a8..f4e74ba 100644
--- a/board/freescale/mx6slevk/MAINTAINERS
+++ b/board/freescale/mx6slevk/MAINTAINERS
@@ -1,7 +1,9 @@
 MX6SLEVK BOARD
 M:	Fabio Estevam <fabio.estevam@freescale.com>
+M:	Peng Fan <Peng.Fan@freescale.com>
 S:	Maintained
 F:	board/freescale/mx6slevk/
 F:	include/configs/mx6slevk.h
 F:	configs/mx6slevk_defconfig
+F:	configs/mx6slevk_spl_defconfig
 F:	configs/mx6slevk_spinor_defconfig