imx: Add support for the SabreSD shipped with i.MX6DL

The SabreSD platform is available with i.MX6Q or i.MX6DL. This patch adds the
support of the i.MX6DL. The config file and the board directory are renamed
to remove the reference to the MX6Q.

Signed-off-by: Pierre Aubert <p.aubert@staubli.com>
CC: Stefano Babic <sbabic@denx.de>
Reviewed-by: Fabio Estevam <fabio.estevam@freescale.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index d3b7e1a..e753e03 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -662,7 +662,7 @@
 	mx31pdk		i.MX31
 	mx53ard		i.MX53
 	mx53smd		i.MX53
-	mx6qsabresd	i.MX6Q
+	mx6sabresd	i.MX6Q/DL
 	mx6qsabreauto	i.MX6Q
 	wandboard	i.MX6DL/S
 	mx6slevk	i.MX6SL