imx8qxp_mek: Add myself as maintainer

I would like to help co-maintaining this board.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
diff --git a/board/freescale/imx8qxp_mek/MAINTAINERS b/board/freescale/imx8qxp_mek/MAINTAINERS
index e9bf0b3..3a21f55 100644
--- a/board/freescale/imx8qxp_mek/MAINTAINERS
+++ b/board/freescale/imx8qxp_mek/MAINTAINERS
@@ -1,5 +1,6 @@
 i.MX8QXP MEK BOARD
 M:	Peng Fan <peng.fan@nxp.com>
+M:	Fabio Estevam <festevam@gmail.com>
 S:	Maintained
 F:	board/freescale/imx8qxp_mek/
 F:	include/configs/imx8qxp_mek.h