Size variables should use the size_t type

[thnkslprpt]

Checklist

• I reviewed the Contributing Guide.
• I performed a cursory search to see if the bug report is relevant, not redundant, nor in conflict with other tickets.

Describe the bug
Most variables representing sizes in MM use size_t.
There are a few that do not follow this custom and could be transitioned over.

Code snips

MM/fsw/src/mm_dump.c

Line 53 in b824250

uint16 ExpectedLength = sizeof(MM_PeekCmd_t);

MM/fsw/src/mm_utils.c

Line 299 in b824250

bool MM_VerifyLoadDumpParams(cpuaddr Address, MM_MemType_t MemType, uint32 SizeInBytes, uint8 VerifyType)

Expected behavior
All size variables that can use size_t should do so - size_t is more expressive and more consistent with the relevant coding guidelines.

Reporter Info
Avi Weiss @thnkslprpt