wifi: libertas: notify firmware load wait on disconnect

Currently, when the firmware is not fully loaded and if_usb_disconnect
is called, if_usb_prog_firmware gets stuck waiting for
cardp->surprise_removed or cardp->fwdnldover while lbs_remove_card
also waits for the firmware loading to be completed, which never happens.
This caused the reported syzbot bug. To address this, the wake_up
function call can be added in the if_usb_disconnect function which notifies
the if_usb_prog_firmware thread and resolves the firmware loading.

Fixes: 954ee164f4f4 ("[PATCH] libertas: reorganize and simplify init sequence")
Reported-and-tested-by: syzbot+c99d17aa44dbdba16ad2@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=c99d17aa44dbdba16ad2
Signed-off-by: Jakov Novak <jakovnovak30@gmail.com>
Link: https://patch.msgid.link/20260504162356.17250-2-jakovnovak30@gmail.com
[fix subject]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

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