As King Charles III battles an unknown form of cancer, palace insiders have revealed that His Majesty is thinking about the Succession to the British Throne — particularly Prince Harry’s place in it. “Because of [Harry’s] previous documentaries, that might be on the mind of not necessarily the King but the royal household — the office that runs it,” former royal butler to the King, Grant Harrold dished. “Harry is still [a] counselor of state and privy to top-secret information because technically he is able to step in for the king, so it doesn’t make sense why he wouldn’t be kept in the loop. …