MLK-13451-2: mx6ul: arm2: lpddr2: add pre charge command all

LPDDR2 script IMX6UL_LPDDR2_400MHz_16bit_V1.1.inc

Updated to add precharge all command per JEDEC
The memory controller may optionally issue a precharge-all command
prior to the MRW reset command
This is strongly recommended to ensure robust DRAM initialization

Signed-off-by: Adrian Alonso <adrian.alonso@nxp.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
(Cherry pick from commit c9483905)

board/freescale/mx6ul_14x14_lpddr2_arm2/imximage.cfg

@@ -107,6 +107,7 @@ DATA 4 0x021B002C 0x0F9F0682
 DATA 4 0x021B0030 0x009F0010
 DATA 4 0x021B0040 0x00000047
 DATA 4 0x021B0000 0x83100000
+DATA 4 0x021B001C 0x00008050
 DATA 4 0x021B001C 0x003F8030
 DATA 4 0x021B001C 0xFF0A8030
 DATA 4 0x021B001C 0x82018030

board/freescale/mx6ul_14x14_lpddr2_arm2/plugin.S

@@ -97,6 +97,8 @@
 	str r1, [r0, #0x040]
 	ldr r1, =0x83100000
 	str r1, [r0, #0x000]
+	ldr r1, =0x00008050
+	str r1, [r0, #0x01C]
 	ldr r1, =0x003F8030
 	str r1, [r0, #0x01C]
 	ldr r1, =0xFF0A8030