Add mx6qarm2 new board revision support using mx6q pop SoC
Enable DRAM support for imx6q PoP SoC with populated LPDDR2
MT42L128M64D2
DDR calibration script
http://sw-stash.freescale.net/projects/IMX/repos/ddr-scripts-rel/commits/e5c6184940486bcbc28978d60ad3cd996c205a08
Test result: Stress test passed.
Signed-off-by: Adrian Alonso