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Implemented Device Lost Timer, which is used to give target device the time to…

Description

Implemented Device Lost Timer, which is used to give target device the time to recover before marking dead.

Issue: IO fails immediately after doing port-toggle.
Fix: Added LDT(Device Lost Timer)- we wait a specific period of time prior to telling the OS about lost device.

Approved by: ken, mav
MFC after: 3 days
Differential Revision: D16196

Details