staging: wilc1000: remove argument hif_drv in host_int_get_ipaddress

This patch removes hif_drv argument of host_int_get_ipaddress.
There is no need to pass hif_drv in this function because hif_drv is a
member of vif. It is removed struct host_if_drv and use hif_drv of vif.

Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>