- Don't blindly use the return value of uart_cpu_channel() to calculate

  the address of a channel on a SCC, it returns 0 on failure. [1]
- Hardcode channel 1 for the keyboard on Z8530, the information present
  in the Open Firmware device tree doesn't allow to determine this via
  uart_cpu_channel(). This makes the keyboard (if one backs out rev. 1.5
  of sys/dev/puc/puc_sbus.c and has both keyboard and mouse plugged in to
  avoid the hang that revision works around) and consequently syscons(4)
  on Ultra 2 work. There's a problem with the keyboard LEDs similar to
  the one on Ultra 60 (LEDs don't get lit under X) though, instead of
  lighting just a specific single one all get lit and can't be turned off
  again. [1]
- Add comments about what uart_cpu_channel() and uart_cpu_getdev_keyboard()
  do and their constraints.
- Improve the comments about what uart_cpu_getdev_[console,dbgport]() do,
  they don't return an address (as in bus) but an Open Firmware package
  handle.

Reviewed by:	marcel (modulo the comments) [1]

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