[RefData][ORI] Fixed a few no longer valid IATA POR.

1. EWY, Newburry, England, UK
2. KHF, RAF Sculthorpe, England, UK
3. GBN, San Giovanni Rotondo, Italy (IT)
4. GHD, Gimbi, Oromiya, Ethiopia (ET)
5. SVR, Svay Rieng, Cambodia (KH)