Staging: hv: netvsc_drv: Get rid of unnecessary state in struct netvsc_driver

Since the function pointers in struct netvsc_driver are no longer used
(as these are invoked directly), get rid of this unused state.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Abhishek Kane <v-abkane@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>