CxPlatTimespecToUs:Microsecond time conversion overflow on 32-bit unix platforms

[noah-hwang]

CxPlatTimespecToUs:Microsecond time conversion overflow on 32-bit unix platforms

Description

Describe the purpose of and changes within this Pull Request.
The timespec structure is defined as follows
struct timespec
{
time_t tv_sec; // Seconds - >= 0
long tv_nsec; // Nanoseconds - [0, 999999999]
};
On a 32-bit platform, time_t t is usually defined as a 32-bit signed integer (int or long) .
Therefore, byte overflow occurs in the following calculation:
#define CXPLAT_MICROSEC_PER_SEC (1000000)
Time->tv_sec * CXPLAT_MICROSEC_PER_SEC
This will cause the calculated microsecond time to be discontinuous, and the time obtained after overflow is smaller than the last time obtained

Testing

Do any existing tests cover this change? Are new tests needed?

Documentation

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.71%. Comparing base (d5c2ac5) to head (fb8d109).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4529      +/-   ##
==========================================
- Coverage   86.25%   85.71%   -0.54%     
==========================================
  Files          56       56              
  Lines       15520    15520              
==========================================
- Hits        13386    13303      -83     
- Misses       2134     2217      +83     

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