Override some default values to work around various issues in the deep,

dirty and murky past.

* Override the default cache line size to be something reasonable if
  it's set to 0.  Some NICs initialise with '0' (eg embedded ones)
  and there are comments in the driver stating that various OSes (eg
  older Linux ones) would incorrectly program things and 0 out this
  register.

* Just default to overriding the latency timer.  Every other driver
  does this.

* Use a default cache line size of 32 bytes.  It should be "reasonable
  enough".

Obtained from:	Linux ath9k, Atheros

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