SWDEV-354898 - Add document for timer function wall_clock64 (#3029)
SWDEV-354898 - Add document for timer function wall_clock64 (#3029)

Change-Id: I5e4caf6e7db6ce8ed93d92700772b1a682bc11f9
ROCm-Developer-Tools/HIP,ROCm-Developer-Tools/HIP,ROCm-Developer-Tools/HIP,ROCm-Developer-Tools/HIP,ROCm-Developer-Tools/HIP