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/arch/arm/mach-keystone/Kconfig b/arch/arm/mach-keystone/Kconfig
index cababdb..d24596e 100644
--- a/arch/arm/mach-keystone/Kconfig
+++ b/arch/arm/mach-keystone/Kconfig
@@ -7,16 +7,19 @@
 config TARGET_K2HK_EVM
 	bool "TI Keystone 2 Kepler/Hawking EVM"
 	select SPL_BOARD_INIT if SPL
+	select CMD_DDR3
 	imply DM_I2C
 
 config TARGET_K2E_EVM
 	bool "TI Keystone 2 Edison EVM"
 	select SPL_BOARD_INIT if SPL
+	select CMD_DDR3
 	imply DM_I2C
 
 config TARGET_K2L_EVM
 	bool "TI Keystone 2 Lamar EVM"
 	select SPL_BOARD_INIT if SPL
+	select CMD_DDR3
 	imply DM_I2C
 
 config TARGET_K2G_EVM
@@ -24,6 +27,7 @@
         select BOARD_LATE_INIT
 	select SPL_BOARD_INIT if SPL
         select TI_I2C_BOARD_DETECT
+	select CMD_DDR3
 	imply DM_I2C
 
 endchoice