mx6sl: Add initial support for mx6slevk board

mx6slevk board is a development board from Freescale based on the mx6 solo-lite
processor.

For details about mx6slevk, please refer to:
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=IMX6SLEVK&parentCode=i.MX6SL&fpsp=1

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 643a5ac..4e04e45 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -664,6 +664,7 @@
 	mx6qsabresd	i.MX6Q
 	mx6qsabreauto	i.MX6Q
 	wandboard	i.MX6DL/S
+	mx6slevk	i.MX6SL
 
 Daniel Gorsulowski <daniel.gorsulowski@esd.eu>