qedr: Add support for RoCE HW init

Allocate and setup RoCE resources, interrupts and completion queues.
Adds device attributes.

Signed-off-by: Rajesh Borundia <[email protected]>
Signed-off-by: Ram Amrani <[email protected]>
Signed-off-by: Doug Ledford <[email protected]>

Author: Ram Amrani