mx6: dts: Move dtbs under SoC level

Place dtbs under SoC level rather than board level.

imx6q-novena.dtb and imx6dl-wandboard-revb1.dtb were
placed under the board config option, so move them
to SoC level.

This also aligns with the kernel dts Makefile format.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 34fdf33..320f0eb 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -544,9 +544,7 @@
 	imx6-apalis.dtb \
 	imx6q-display5.dtb \
 	imx6q-logicpd.dtb \
-	imx6q-novena.dtb
-
-dtb-$(CONFIG_TARGET_TBS2910) += \
+	imx6q-novena.dtb \
 	imx6q-tbs2910.dtb
 
 dtb-$(CONFIG_MX6QDL) += \
@@ -556,6 +554,7 @@
 	imx6dl-mamoj.dtb \
 	imx6dl-sabreauto.dtb \
 	imx6dl-sabresd.dtb \
+	imx6dl-wandboard-revb1.dtb \
 	imx6q-cm-fx6.dtb \
 	imx6q-icore.dtb \
 	imx6q-icore-mipi.dtb \
@@ -565,9 +564,6 @@
 	imx6qp-sabreauto.dtb \
 	imx6qp-sabresd.dtb
 
-dtb-$(CONFIG_TARGET_WANDBOARD) += \
-	imx6dl-wandboard-revb1.dtb
-
 dtb-$(CONFIG_MX6SL) += imx6sl-evk.dtb
 
 dtb-$(CONFIG_MX6SLL) += imx6sll-evk.dtb