imx: mx6q DDR3 init: Fix tXPR

MMDC1_MDOR.tXPR should be set as specified for the JEDEC DDR3 timing tXPR.

For all DDR3 speed bins:
  tXPR(min) = max(5 nCK, tRFC(min) + 10 ns)
  tRFC(2 Gb) = 160 ns

All the users of mx6q_4x_mt41j128.cfg have a 2-Gb density (Micron
MT41J128M16HA-15E or SK hynix H5TQ2G63BFR-H9C for i.MX6Q SABRE Lite, and Micron
MT41K128M16JT-125:K for i.MX6 SABRE SD).

Hence, MMDC1_MDOR.tXPR should be set to max(5 nCK, 170 ns), which is 170 ns
and 91 nCK at 532 MHz, encoded as 0x5A in the bit-field MMDC1_MDOR[23:16].

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>

board/freescale/imx/ddr/mx6q_4x_mt41j128.cfg

@@ -114,7 +114,7 @@ DATA 4 0x021b0010 0xFF538F64
 DATA 4 0x021b0014 0x01FF00DB
 DATA 4 0x021b002c 0x000026D2
 
-DATA 4 0x021b0030 0x005B0E21
+DATA 4 0x021b0030 0x005A0E21
 DATA 4 0x021b0008 0x09444040
 DATA 4 0x021b0004 0x00025576
 DATA 4 0x021b0040 0x00000027