IOMX: allow configuration after going to loaded state

This was disallowed recently but we still use it as MediaCodcec.stop
only goes to loaded state, and does not free component.

Bug: 31450460
Change-Id: I72e092e4e55c9f23b1baee3e950d76e84a5ef28d
(cherry picked from commit e03b22839d78c841ce0a1a0a1ee1960932188b0b)