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This commit implements hostapd global control interface notifications
infrastructure. hostapd global control interface clients issue
ATTACH/DETACH commands to register and deregister with hostapd
correspondingly - the same way as for any other hostapd/wpa_supplicant
control interface.

Bug: 24270573

Change-Id: I46da39e8262a446e7779a1adfbcb08b5bfa382d7
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>