net/bnxt: support ULP session manager cleanup

net/bnxt: support ULP session manager cleanup

A ULP session will contain all the resources needed to support
rte flow offloads. A session is initialized as part of rte_eth_device
start. A DPDK application can have multiple interfaces which
means rte_eth_device start will be called for each of these devices.
ULP session manager will make sure that a single ULP session is only
initialized once. Apart from this, it also initializes MARK database,
EEM table & flow database. ULP session manager also manages a list of
all opened ULP sessions.

This patch adds support for cleaning up resources initialized for ULP
sessions.

Signed-off-by: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>
Signed-off-by: Mike Baucom <michael.baucom@broadcom.com>
Reviewed-by: Lance Richardson <lance.richardson@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>