NEW YORK -- Not everyone who works for a big company gets face time with their so-called big boss. Former child star Hayley Mills, whose most memorable roles include the happy-go-lucky orphan in “Pollyanna” and as both savvy twins hoping to mend their family in “The Parent Trap,” called the filmmaking icon Walt Disney her boss for seven years when she was under contract with the studio.“He was very present,” recalled Mills, now 75, from her home in London.