MdePkg/IndustryStandard: add definitions for CXL CEDT

[Ax-WangYuQuan]

Description

This adds #defines and struct typedefs for the various structure types in the CXL3.1 CXL Early Discovery Table (CEDT).

How This Was Tested

Include this header file for platform CEDT creation.

[Ax-WangYuQuan]

This is my first time to start a pull requesting, so any instances if I have deviated from the standard practices or fallen short of the expected norms, please do not hesitate to inform me.

[mdkinney]

Since this is part of CXL 3.1 specification, why not use file name Cxl3.1 so all content that is introduced in that version of the specs are added to that one file. Were these definitions included in an earlier version of the CXL spec?

Also, the ChangeID tag in the commit message should be removed

[Ax-WangYuQuan]

Since this is part of CXL 3.1 specification, why not use file name Cxl3.1 so all content that is introduced in that version of the specs are added to that one file. Were these definitions included in an earlier version of the CXL spec?

Also, the ChangeID tag in the commit message should be removed

Thanks

[Ax-WangYuQuan]

Since this is part of CXL 3.1 specification, why not use file name Cxl3.1 so all content that is introduced in that version of the specs are added to that one file. Were these definitions included in an earlier version of the CXL spec?

If some structures were introduced from CXL 2.0, CXL 3.0, CXL 3.1 respectively, should I put these into/add the corresponding file?

The previous files (Cxl11.h, Cxl20.h) mainly contain the register definitions in CXL spec, which is mentioned in their header descriptions, but the CEDT is one type of acpi tables rather than registers, maybe there need a single separate file to define it?

[mergify]

⚠️ The sha of the head commit of this PR conflicts with #6434. Mergify cannot evaluate rules on this PR. ⚠️