Support LPDDR2 (interleave mode) on 6DL platform

6DL ARM2 LPDDR2 platform in Linux BSP is maintained in this release.
The DRAM init sequence in flash header has been verified in DDR
stress test. 400MHz and 24MHz frequency switching and suspend/resume
in OS are also verified.

Conflicts:

	arch/arm/mach-mx6/Makefile
	arch/arm/mach-mx6/mx6_mmdc.c
Revert Power Reduce patch since it's unused currently.
Fix mfg updater config compiling error.
Applying LPDDR2 single channel patch for iMX6 .
This patch is from https://community.freescale.com/docs/DOC-97564.