ARM: OMAP4470: Add Elpida EDB8164B3PF memory configuration

ARM: OMAP4470: Add Elpida EDB8164B3PF memory configuration

OMAP4470 SDP SoM has EDB8164B3PF PoP memory on board.
This memory has 4Gb x 2CS = 8Gb configuration.
Add configuration for runtime calculation and precalculated cases.

Patch is based on a draft Lubomir's patch [1].

[1] http://lists.denx.de/pipermail/u-boot/2013-April/150851.html

Signed-off-by: Lubomir Popov <lpopov@mm-sol.com>
[taras@ti.com: cleaned up patch and fixed precalculated values]
Signed-off-by: Taras Kondratiuk <taras@ti.com>