Add TWT service bit capability support to check whether firmware
supports ack event or not. If firmware doesn't support ack event
then service bit capability will become 0 and whenever TWT
command comes, host will not wait for ack event and sends command
in a legacy way.
This support is mainly added to handle new host and old firmware
combination.
Change-Id: I55d373c2e017130b58a4b332da16f0eda8f34eba
CRs-Fixed: 2987749