EmbeddedPkg: Enable build under VS2019 and fix build errors. (#282)

## Description

Turn off modules in EmbeddedPkg's that cannot be compiled under VS.
Fix multiple 64 to 32 bit conversions.


8fa524e
6d66d4a (already included in #287)

- [ ] Impacts functionality?
- **Functionality** - Does the change ultimately impact how firmware
functions?
- Examples: Add a new library, publish a new PPI, update an algorithm,
...
- [ ] Impacts security?
- **Security** - Does the change have a direct security impact on an
application,
    flow, or firmware?
  - Examples: Crypto algorithm change, buffer overflow fix, parameter
    validation improvement, ...
- [ ] Breaking change?
- **Breaking change** - Will anyone consuming this change experience a
break
    in build or boot behavior?
- Examples: Add a new library class, move a module to a different repo,
call
    a function in a new library class in a pre-existing module, ...
- [ ] Includes tests?
  - **Tests** - Does the change include any explicit test code?
  - Examples: Unit tests, integration tests, robot tests, ...
- [ ] Includes documentation?
- **Documentation** - Does the change contain explicit documentation
additions
    outside direct code modifications (and comments)?
- Examples: Update readme file, add feature readme file, link to
documentation
    on an a separate Web page, ...

## How This Was Tested
Local CI.

## Integration Instructions
N/A

Co-authored-by: Bret Barkelew <[email protected]>

EmbeddedPkg/Library/GdbSerialDebugPortLib/GdbSerialDebugPortLib.c

@@ -17,7 +17,8 @@
 #include <Protocol/DebugPort.h>
 
 EFI_DEBUGPORT_PROTOCOL  *gDebugPort = NULL;
-UINT32                  gTimeOut    = 0;
+// UINTN                   gTimeOut = 0;  // MU_CHANGE TCBZ3616
+UINT32  gTimeOut = 0;                     // MU_CHANGE TCBZ3616
 
 /**
   The constructor function initializes the UART.