staging: wilc1000: set hif_drv before it is used

We are using hif_drv of vif, so it needs to be set before it is used.
Set hif_drv to vif->hifdrv soon after it is allocated.

Signed-off-by: Glen Lee <glen.lee@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>