MdePkg IndustryStandard: Add DDR3, DDR4 and LPDDR definition per SPD spec

MdePkg IndustryStandard: Add DDR3, DDR4 and LPDDR definition per SPD spec

https://bugzilla.tianocore.org/show_bug.cgi?id=201

In V3, Use Odt to replace ODT, Cke to replace CKE, Id to replace ID,
and Cl to replace CL in structure field name.

In V2, separate DDR3, DDR4 and LPDDR definition into the different files;
use the different SPD prefix as structure definitions for each SPD type.

Cc: Giri P Mudusuru <giri.p.mudusuru@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Giri P Mudusuru <giri.p.mudusuru@intel.com>