Revert "cld80211lib: Remove sendmsg to driver during cleanup"

This reverts commit 111c8ab7.

The commit to be reverted intents to fix get_multicast_id
hang when driver stopped prior to cleanup. But it causes
cld80211_remove_mcast_group always return -ENOENT with an
error message, and nl_socket_drop_membership never has a
change to be called.
"[ERROR] Could not find group XXXXX, errno: 2 id: -2"

Change-Id: I469b329dfcfcb66fc442c4a49617ba7aa0eff23c
CRs-Fixed: 2752447