USB: EHCI: fix remote-wakeup support for ARC/TDI core

USB: EHCI: fix remote-wakeup support for ARC/TDI core

This patch (as1147) fixes the remote-wakeup support for EHCI
controllers using the ARC/TDI "embedded-TT" core.  These controllers
turn off the RESUME bit by themselves when a port resume is complete;
hence we need to keep separate track of which ports are suspended or
in the process of resuming.

The patch also makes a couple of small improvements in ehci_irq(),
replacing reads of the command register with the value already stored
in a local variable.

Signed-off-by: Alan Stern <[email protected]>
Tested-by: Thomas Reitmayr <[email protected]>
CC: David Brownell <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>