New kernel option in F8/devel: libata.pata_dma

[Chuck Ebbert]

I just checked in a patch from Alan that allows selectively disabling
DMA on libata PATA drives:

       libata.pata_dma= [LIBATA]
               libata.pata_dma=0       Disable all PATA DMA like old IDE
               libata.pata_dma=1       Disk DMA only
               libata.pata_dma=2       ATAPI DMA only
               libata.pata_dma=4       CF DMA only

These can be combined, e.g. libata.pata_dma=3 will enable DMA on disks
and ATAPI devices (mainly CD-ROM) while leaving it disabled on Compact
Flash.

This should allow installation on systems where DMA doesn't work, so the
problem can be fixed later by a kernel update.