Riley Keough agrees to $1 million settlement with Priscilla Presley.
Legal battle over Lisa Presley's $35 million will.
Riley to pay $400,000 for legal fees and costs.
$1 million payment to be made within 10 days.
Priscilla resigns as trustee.
Riley becomes sole trustee of her mother's estate.
Riley to oversee sub-trusts for half-sisters.
Priscilla acts as trustee for son Navarone Garibaldi's sub-trust.