- Bunch of cleanups by Bartlomiej (accounts for over a half of the patch):

    cmd64x.c:
	- kill SPLIT_BYTE() macro
	- kill wrappers for cmd64x_config_drive_for_dma()
	- misc cleanups

    cy82c693.c:
	- kill obsolete comments
	- clean cy82c693_tune_drive() and calc_clk()
	- misc cleanups

    hpt34x.c:
	- kill obsolete comment
	- kill SPLIT_BYTE()
	- kill hpt34x_clear_chipset()
	- simplify hpt34x_tune_drive()

    hpt366.c:
	- kill hpt_min_rev()
	- kill redundant hpt368_tune_chipset() and hpt374_tune_chipset()
	- fix badlists checking in config_chipset_for_dma()
	- misc cleanups

    pdc202xx.c:
	- clean registers decoding
	- clean pdc202xx_tune_chipset()
	- kill pdc202xx_udma_irq_status(), use generic udma_pci_irq_status()
	- rationalize pdc202xx_reset()
	- kill UDMA_SPEED_FLAG() and PDC_CLOCK() macros,
	  do it right by defining constants PDC_UDMA and PDC_CLK
	- kill init_high_16() inline, no need to hide internals
	- clean pdc202xx_init_chipset()
	- split ata66_pdc202xx() and pdc202xx_init_chipset()
	- clean config_chipset_for_dma()
	- misc cleanups

 - Fix plug in of CF cards. The previously used sub device driver attach method
   lookup was entirely hosed.

 - Enforce indentation style on ide-cs.c. Enable debugging there. (Makes the
   patch quite big...)