xhci: Change xhci_update_pipe() to xhci_realloc_pipe() and use for alloc too

Instead of exporting both xhci_alloc_pipe() and xhci_update_pipe(),
export only xhci_realloc_pipe() and support alloc, update, and free
from it.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
3 files changed