EFI,FlashCore: Trying to get ring-0 callback for the flash up and going. bugref:6940
FlashCore:
Ring-0 support.
Don't keep pDevIns in the structure, let the parent pass it in.
Adjustments for new PDM device style.
Function documentations at the place of implementation rather than the header,
please. We only put it in headers under /include/, and even there only really
for iprt as it may have 10 different implementations of each function.