Bluetooth: host: Fix notify multiple issue
Bluetooth: host: Fix notify multiple issue

When multiple notify feature is enabled, notifications are pushed
twice. Host sends multiple notify with BT_ATT_OP_NOTIFY_MULT and
then continues to send regular notification with BT_ATT_OP_NOTIFY.

Fixes: https://github.com/zephyrproject-rtos/zephyr/issues/40546

Signed-off-by: Ilhan Ates <dfb2f2eda04d4d9d9e58039751fb26dcf478da6a@nordicsemi.no>

zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr