AHCI - Minor fixes

AHCI - Minor fixes

* Fix a conditional testing for hot plug removal.  This is mostly
  cosmetic but prevents a bogus "Device removed" message when plugging
  IN devices on ports which do not support hot-plug.

* Print the port capabilities out for each port during device probe.
  This makes it easier to diagnose bug reports if people try to use
  hot-plug on devices (usually old AHCI 1.0 chipsets) which do not
  support hot-plug.  These chipsets do not do device detection on
  the port change event and also usually do not implement CLO, so
  there isn't much the driver can do.