Kernel: Update the ".." inode for directories after a rename

Because the ".." entry in a directory is a separate inode, if a
directory is renamed to a new location, then we should update this entry
the point to the new parent directory as well.

Co-authored-by: Liav A <liavalb@gmail.com>

Kernel/FileSystem/SysFS/Inode.cpp

@@ -90,6 +90,11 @@ ErrorOr<void> SysFSInode::remove_child(StringView)
     return EROFS;
 }
 
+ErrorOr<void> SysFSInode::replace_child(StringView, Inode&)
+{
+    return EROFS;
+}
+
 ErrorOr<void> SysFSInode::chmod(mode_t)
 {
     return EPERM;