[RFC][PATCH 4/4] ahci: support hot plug when port/controller is runtime suspended

[Lin Ming]

This is an empty patch now :)

I use eSATA to test disk hot plug.
With previous 3 patches applied, disk hot plug does not wok
when ahci port/controller is runtime suspended.

There are 2 cases we need to handle for hot plug:

1. port suspended, controller active
   Is IRQ need to be enabled for port to detect hot plug? 

2. port suspended, controller suspended
   Will controller get a PME when hot plug happens?

I'm still investigating hot plug support.

Anyone has comment?

Thanks,
Lin Ming
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