libertas: support USB persistence on suspend/resume (resend)

Handle .reset_resume() so that libertas can survive suspend/resume without
reloading the firmware.

Signed-off-by: Andrey Yurovsky <andrey@cozybit.com>
Acked-by: Deepak Saxena <dsaxena@laptop.org>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/libertas/if_usb.c b/drivers/net/wireless/libertas/if_usb.c
index 8032df7..36288b2 100644
--- a/drivers/net/wireless/libertas/if_usb.c
+++ b/drivers/net/wireless/libertas/if_usb.c
@@ -925,6 +925,7 @@
 	.id_table = if_usb_table,
 	.suspend = if_usb_suspend,
 	.resume = if_usb_resume,
+	.reset_resume = if_usb_resume,
 };
 
 static int __init if_usb_init_module(void)