Add return character when set the PM policy using sysfs

When set PM policy in sysfs, the driver expect a return character.

Change-Id: I83cddb3cdb14c226e6e856776176000eea33b251

rocm_smi/src/rocm_smi.cc

@@ -2247,7 +2247,8 @@ rsmi_dev_xgmi_plpd_set(uint32_t dv_ind,
   DEVICE_MUTEX
   GET_DEV_FROM_INDX
 
-  std::string value = std::to_string(plpd_id);
+  // Need to add new line character
+  std::string value = std::to_string(plpd_id) + "\n";
   int ret = dev->writeDevInfo(amd::smi::kDevXgmiPlpd , value);
   return amd::smi::ErrnoToRsmiStatus(ret);
 
@@ -2360,7 +2361,8 @@ rsmi_dev_soc_pstate_set(uint32_t dv_ind,
   DEVICE_MUTEX
   GET_DEV_FROM_INDX
 
-  std::string value = std::to_string(policy_id);
+  // need to add new line character
+  std::string value = std::to_string(policy_id) + "\n";
   int ret = dev->writeDevInfo(amd::smi::kDevSocPstate , value);
   return amd::smi::ErrnoToRsmiStatus(ret);