am33xx: ddr_defs.h: Change DDR timings

* For cold silicon the DDR timings need to be relaxed in order for
  the device to boot with DDR at 266MHz
* Fix proposed by James Doublesin

Signed-off-by: Chase Maupin <Chase.Maupin@ti.com>

arch/arm/include/asm/arch-am33xx/ddr_defs.h

@@ -36,7 +36,7 @@
 #define CMD_FORCE		0x00
 #define CMD_DELAY		0x00
 
-#define EMIF_READ_LATENCY	0x04
+#define EMIF_READ_LATENCY	0x05
 #define EMIF_TIM1		0x0666B3D6
 #define EMIF_TIM2		0x143731DA
 #define EMIF_TIM3		0x00000347