Staging: hv: netvsc_drv: Get rid of some unnecessary/dead code from rndis_filter.c

After the cleanup that has been done, some code in rndis_filter.c
is no longer needed; get rid of it.

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>