- style(9) cleanup

- style(9) cleanup
- allow rl_detach to be used for all error recovery in rl_attach
- drop rl_unit and use device_printf instead
- rl_list_tx_init can't fail, make it void
- eliminate splimp in rl_attach, drop it ASAP in rl_detach
- use DEFINE_CLASS_0 instead of expanding it manually

From FreeBSD:
- support cardbus attachments
- support 6bit and 8bit EEPROMs
- use ether_crc32_be instead of local code
- fix some unnessary watchdog conditions
- depend on miibus
- use pci_get_powerstate()/pci_set_powerstate()
- add various PCI and CardBus devices
- bus_dma conversion