ARM: dts: imx6dlq-wandboard-revb1.dts: use unique model id

Downstream packages like Debian flash-kernel use
/proc/device-tree/model
to determine which dtb file to install.

Hence each dts in the Linux kernel should provide a unique model
identifier.

Commit 8536239e371f ("ARM: dts: Restructure imx6qdl-wandboard.dtsi for new
rev C1 board.")' created new files imx6dl-wandboard-revb1.dts and
imx6q-wandboard-revb1.dts but used the same model identifier as in
imx6dl-wandboard.dts and imx6q-wandboard.dts.

This patch provides unique model identifiers for revision B1 of
the Wandboard Dual and Wandbaord Quad.

The patch leaves imx6dl-wandboard.dts and imx6q-wandboard.dts unchanged
because it is not foreseeable if the same dts will valid for future
board revisions or not. Furthermore we should avoid unnecessary
changes.

Signed-off-by: Heinrich Schuchardt <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

arch/arm/boot/dts/imx6dl-wandboard-revb1.dts

···
 #include "imx6qdl-wandboard-revb1.dtsi"
 
 / {
-	model = "Wandboard i.MX6 Dual Lite Board";
+	model = "Wandboard i.MX6 Dual Lite Board rev B1";
 	compatible = "wand,imx6dl-wandboard", "fsl,imx6dl";
 
 	memory {

arch/arm/boot/dts/imx6q-wandboard-revb1.dts

···
 #include "imx6qdl-wandboard-revb1.dtsi"
 
 / {
-	model = "Wandboard i.MX6 Quad Board";
+	model = "Wandboard i.MX6 Quad Board rev B1";
 	compatible = "wand,imx6q-wandboard", "fsl,imx6q";
 
 	memory {