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.