Removed CPER tests and adjust the implementation (#269)

- Moved helper functions into amdsmi_utils.cc
- Removed tests since they are not working.

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Co-authored-by: Saeed, Oosman <Oosman.Saeed@amd.com>

include/amd_smi/impl/amd_smi_utils.h

@@ -54,6 +54,7 @@ amdsmi_status_t smi_amdgpu_get_market_name_from_dev_id(amd::smi::AMDSmiGPUDevice
 amdsmi_status_t smi_amdgpu_is_gpu_power_management_enabled(amd::smi::AMDSmiGPUDevice* device, bool *enabled);
 std::string smi_split_string(std::string str, char delim);
 std::string smi_amdgpu_get_status_string(amdsmi_status_t ret, bool fullStatus);
+amdsmi_status_t amdsmi_get_gpu_cper_entries_by_path(const char *amdgpu_ring_cper_file, uint32_t severity_mask, char *cper_data, uint64_t *buf_size, amdsmi_cper_hdr_t **cper_hdrs, uint64_t *entry_count, uint64_t *cursor);
 
 /**
  *  @brief Get the device index given the processor handle.