cmd: ti: Generalize cmd_ddr3 command

Keystone and DRA7 based TI platforms uses same
EMIF memory controller. cmd_ddr3 command is customized
for keystone platforms, make it generic so that it can
be re used for DRA7  platforms.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>

arch/arm/include/asm/emif.h

@@ -17,7 +17,9 @@
 #include <asm/io.h>
 
 /* Base address */
+#ifndef EMIF1_BASE
 #define EMIF1_BASE				0x4c000000
+#endif
 #define EMIF2_BASE				0x4d000000
 
 #define EMIF_4D					0x4