King Charles III and Kate, Princess of Wales, may have only gotten a phone call from Meghan Markle and Prince Harry as a “courtesy.” “We understand that they’ve reached out both to the king and the Princess of Wales. Is that a thawing of relations, or is it just a human courtesy? I think probably the latter,” royal expert Katie Nicholl told an outlet. “I think it is courtesy more than the sign of any softening of relations, particularly between the couple and Princess Catherine,” she added. “Whatever has happened, the king loves his son. We know that there were calls at the end of last year, a…