drivers: rmnet_shs: Napi flush fix

Previusly we would send TCP packets to gro using gro_receive
but flush in napi context. This would make the flush useless.
This will align the delivery with the flushing so that napi_flush
correctly triggers a gro flush.

CRs-Fixed: 2348700
Change-Id: I3eb173351ae96d172fc03b65c3c7ab8c9ad31fd9
Acked-by: Raul Martinez <mraul@qti.qualcomm.com>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>