[SWDEV-545128] Implement some changes in AMD-SMI to aggregate metric from primary and secondary KFD processes

[koushikbillakanti-amd]

Motivation

This PR adds support for parsing per-GPU KFD process files that use the _NNNN suffix naming convention (e.g., vram_46775, stats_46775/).
The ROCm kernel driver exposes per-GPU process statistics in /sys/class/kfd/kfd/proc/PID/ with GPU-specific file suffixes.
Without this change, AMD-SMI cannot read process memory usage and statistics on systems using this KFD file structure.

Technical Details

Modified src/rocm_smi_kfd.cc and rocm_smi_kfd.cc to parse files with _NNNN GPU ID suffixes.
Added logic to read cu_occupancy and evicted_ms from stats_NNNN/ subdirectories under each process.
The implementation maintains backward compatibility with older KFD structures while supporting the new per-GPU naming convention.

JIRA ID

Resolves [SWDEV-545128]

Test Plan

Built AMD-SMI from source and ran amd-smi process command with active GPU workloads.
Verified KFD directory structure parsing by inspecting /sys/class/kfd/kfd/proc/PID/ contents.
Tested both text and JSON output formats to confirm correct data retrieval.

Test Result

Process detection working correctly - PID, process name, and memory usage displayed.
Per-GPU stats (cu_occupancy=0, evicted_ms=0) read successfully from stats_46775/ directory.
All tests passed on MI300A GPU with KFD_ID 46775.

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.