xhci: remove unused command member from struct xhci_hcd struct

The u32 command was added to struct xhci_hcd over 10 years ago in
commit 9777e3ce ("USB: xHCI: bus power management implementation")

It wasn't even used back then, so remove it.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20220921123450.671459-6-mathias.nyman@linux.intel.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>