32-bit DMA fixes in the ATA driver.
32-bit DMA fixes in the ATA driver.

A 32-bit page is allocated for the PRDT and a 32-bit bounce buffer is
used with DMA when reading/writing to a buffer above 4GB instead of
falling back on slow PIO transfers.

froggey/Mezzano,AugustusHuang/Mezzano,rvedam/Mezzano,varjagg/Mezzano,AugustusHuang/Mezzano,froggey/Mezzano,rvedam/Mezzano,varjagg/Mezzano