This fixes storport build
- Implement AcquireSpinlock, ReleaseSpinlock and GetExtendedFunctionTable notifications. - Implement a bus scan routine, borrowed from scsiport. Storport and storahci are now able to detect a disk device attached to a Virtual Box AHCI controller.
- Add the StorPortExtendedFunction stub to the storport driver. - Add the declaration of StorPortExtendedFunction to the ddk. CORE-12695