xhci: dbc: Don't pass the xhci pointer as a parameter to xhci_dbc_init_context()

xhci_dbc_init_context() no longer needs the struct xhci_hcd pointer.
Pass the dbc pointer directly instead.

No functional changes
This change helps decoupling xhci and DbC

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20200723144530.9992-11-mathias.nyman@linux.intel.com


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