arm: ti: logicpd-torpedo: Migrate to OF_UPSTREAM

The DM37 and OMAP35 Torpedo share a few files, but both of them
can be migrated to OF_UPSTREAM with a small update to their
respective u-boot.dtsi files to address changes made the aliases.
Both defconfigs need to properly point to the upstream directory
structure for the device trees.  With those updated, the U-Boot
device tree files can be deleted.

Signed-off-by: Adam Ford <aford173@gmail.com>

V2:  Remove DT from Makefile
diff --git a/arch/arm/dts/logicpd-torpedo-35xx-devkit-u-boot.dtsi b/arch/arm/dts/logicpd-torpedo-35xx-devkit-u-boot.dtsi
index 4744872..d14d68e 100644
--- a/arch/arm/dts/logicpd-torpedo-35xx-devkit-u-boot.dtsi
+++ b/arch/arm/dts/logicpd-torpedo-35xx-devkit-u-boot.dtsi
@@ -14,6 +14,8 @@
 	aliases {
 		/delete-property/ serial1;
 		/delete-property/ serial2;
+		/delete-property/ mmc1;
+		/delete-property/ mmc2;
 	};
 
 	ethernet@08000000 {