net/bnx2x: fix reading VF id

net/bnx2x: fix reading VF id

The logic to read vf_id used by ACQUIRE/TEARDOWN_Q/RELEASE TLVs,
multiplexed return value to convey vf_id value and status of read vf_id
API. This lets to segfault at dev_start() as resources are not properly
cleaned and re-allocated.

Fix read vf_id API to differentiate between vf_id value and return
status. Adjust the status checking accordingly.
Added bnx2x_vf_teardown_queue() API and moved relevant code from
bnx2x_vf_unload() to new API.

Fixes: 540a211084a7 ("bnx2x: driver core")
Cc: stable@dpdk.org
Signed-off-by: Rasesh Mody <rmody@marvell.com>