MdePkg: Update BASE_CR macro in Base.h for a Coverity error

[philnoh2]

Coverity is a static analysis tool. It detects the macro as an error (case to incompatible type, cert_exp39_c_violation). The update resolves the error and supports compliance with the static tool.

For example,
MdeModulePkg\Universal\HiiDatabaseDxe\Database.c

Code :
Entry = BASE_CR (Link, VARSTORAGE_DEFAULT_DATA, Entry);

Coverity Error :
(3) Event cast_to_incompatible_type: Casting "(CHAR8 *)Link - 0ULL" of type "CHAR8 *" to incompatible type "VARSTORAGE_DEFAULT_DATA *".
(4) Event assign: Assigning: "Entry" = "(VARSTORAGE_DEFAULT_DATA *)((CHAR8 *)Link - 0ULL)".
Also see events: [cert_exp39_c_violation]

• Breaking change?
  • Breaking change - Does this PR cause a break in build or boot behavior?
  • Examples: Does it add a new library class or move a module to a different repo.
• Impacts security?
  • Security - Does this PR have a direct security impact?
  • Examples: Crypto algorithm change or buffer overflow fix.
• Includes tests?
  • Tests - Does this PR include any explicit test code?
  • Examples: Unit tests or integration tests.

How This Was Tested

The update has been tested and verified on AMD EDKII bios. With it, the Coverity error is resolved.

Integration Instructions

N/A