Add support for CS5535 IDE adapted from the gcscide code in NetBSD

originally written by Juan Romero Pardines.

Thanks to Lars Kotthoff for testing on a HeroLogic HL-463 system.

Because the CS5535 doesn't provide SMM emulated PCI access to set
DMA/PIO modes or a real PCI IDE controller we have to resort to
making MSR calls.  As this is very MD specific, hide most of uglyness
away in i386 MD pciide code.

ok grange@

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