swap out CopyString with memcpy using src buffer size

Author: mykrupp

examples/lock-app/silabs/include/LockManager.h

@@ -116,7 +116,7 @@ using namespace EFR32DoorLock::ResourceRanges;
 
 struct LockUserInfo
 {
-    char userName[DOOR_LOCK_USER_NAME_BUFFER_SIZE];
+    char userName[DOOR_LOCK_MAX_USER_NAME_SIZE];
     size_t userNameSize;
     uint32_t userUniqueId;
     UserStatusEnum userStatus;

examples/lock-app/silabs/src/LockManager.cpp

@@ -445,7 +445,7 @@ bool LockManager::SetUser(chip::EndpointId endpointId, uint16_t userIndex, chip:
         return false;
     }
 
-    chip::Platform::CopyString(userInStorage.userName, userName.data());
+    memcpy(userInStorage.userName, userName.data(), userName.size());
     userInStorage.userNameSize   = userName.size();
     userInStorage.userUniqueId   = uniqueId;
     userInStorage.userStatus     = userStatus;