ARM: AM335x: Enable DDR dynamic IO power down

This patch enables dynamically powering down the
IO receiver when not performing a read on boards using DDR3.
This optimizes both active and standby power consumption.
This bit is not set on EVM SK and EVM 1.5 and later boards.
Setting the same.

This has been tested on PG2.0 EVM1.5, EVM1.2, EVM-SK, BBB.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Satyanarayana, Sandhya <sandhya.satyanarayana@ti.com>

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

@@ -43,7 +43,7 @@
 #define MT47H128M16RT25E_IOCTRL_VALUE		0x18B
 
 /* Micron MT41J128M16JT-125 */
-#define MT41J128MJT125_EMIF_READ_LATENCY	0x06
+#define MT41J128MJT125_EMIF_READ_LATENCY	0x100006
 #define MT41J128MJT125_EMIF_TIM1		0x0888A39B
 #define MT41J128MJT125_EMIF_TIM2		0x26337FDA
 #define MT41J128MJT125_EMIF_TIM3		0x501F830F
@@ -65,7 +65,7 @@
 #define MT41J256MJT125_EMIF_SDCFG		0x61C04B32
 
 /* Micron MT41J256M8HX-15E */
-#define MT41J256M8HX15E_EMIF_READ_LATENCY	0x06
+#define MT41J256M8HX15E_EMIF_READ_LATENCY	0x100006
 #define MT41J256M8HX15E_EMIF_TIM1		0x0888A39B
 #define MT41J256M8HX15E_EMIF_TIM2		0x26337FDA
 #define MT41J256M8HX15E_EMIF_TIM3		0x501F830F
@@ -97,7 +97,7 @@
 #define MT41K256M16HA125E_IOCTRL_VALUE		0x18B
 
 /* Micron MT41J512M8RH-125 on EVM v1.5 */
-#define MT41J512M8RH125_EMIF_READ_LATENCY	0x06
+#define MT41J512M8RH125_EMIF_READ_LATENCY	0x100006
 #define MT41J512M8RH125_EMIF_TIM1		0x0888A39B
 #define MT41J512M8RH125_EMIF_TIM2		0x26517FDA
 #define MT41J512M8RH125_EMIF_TIM3		0x501F84EF
@@ -113,7 +113,7 @@
 #define MT41J512M8RH125_IOCTRL_VALUE		0x18B
 
 /* Samsung K4B2G1646E-BIH9 */
-#define K4B2G1646EBIH9_EMIF_READ_LATENCY	0x07
+#define K4B2G1646EBIH9_EMIF_READ_LATENCY	0x100007
 #define K4B2G1646EBIH9_EMIF_TIM1		0x0AAAE51B
 #define K4B2G1646EBIH9_EMIF_TIM2		0x2A1D7FDA
 #define K4B2G1646EBIH9_EMIF_TIM3		0x501F83FF