Fix prefast scan complaints (#14823)
### Description
Fix prefast warning
https://dev.azure.com/aiinfra/ONNX%20Runtime/_workitems/edit/12821/
### Motivation and Context
This one is just excessive and annoying. It warned that I should cast
value to 8bytes before using * operator. But the expression is:
(size_t(64) * size_t(1024))
size_t is 8 bytes on 64b systems. And when it is 4 bytes on 32b systems,
the cast is expensive and completely unnecessary.
