arm: keystone: Move cmd_ddr3 to a common place

Move cmd_ddr3 to cmd/ti in order to make
it build for non-keystone TI platforms.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
[trini: Rename to ddr3.c not cmd_ddr3.c]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/ti/Makefile b/cmd/ti/Makefile
new file mode 100644
index 0000000..7dba66f
--- /dev/null
+++ b/cmd/ti/Makefile
@@ -0,0 +1,10 @@
+# Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj- += dummy.o
+
+ifndef CONFIG_SPL_BUILD
+obj-$(CONFIG_CMD_DDR3) += ddr3.o
+endif