arm: am437x: cm-t43: Add device tree, enable OF_CONTROL

Add device tree from Linux for driver model conversion
and enable OF_CONTROL. This will remove the following compile
warning:
==================================================
Device Tree Source is not correctly specified.
Please define 'CONFIG_DEFAULT_DEVICE_TREE'
or build with 'DEVICE_TREE=<device_tree>' argument
===================================================
Target was compile tested, build was clean.

Signed-off-by: Suniel Mahesh <sunil.m@techveda.org>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index aac1b83..62da168 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -302,7 +302,8 @@
 dtb-$(CONFIG_AM43XX) += am437x-gp-evm.dtb am437x-sk-evm.dtb	\
 	am43x-epos-evm.dtb \
 	am437x-idk-evm.dtb \
-	am4372-generic.dtb
+	am4372-generic.dtb \
+	am437x-cm-t43.dtb
 dtb-$(CONFIG_TARGET_AM3517_EVM) += am3517-evm.dtb
 dtb-$(CONFIG_TI816X) += dm8168-evm.dtb
 dtb-$(CONFIG_THUNDERX) += thunderx-88xx.dtb