Bluetooth: hci_core: Rework hci_dev_do_reset() to use hci_sync functions

Bluetooth: hci_core: Rework hci_dev_do_reset() to use hci_sync functions

The current HCI reset function in hci_core.c duplicates most of the work
done by hci_dev_close_sync(), and doesn't handle LE, advertising or
discovery.

Instead of porting these to hci_dev_do_reset(), directly call the
close/open functions from hci_sync to reset the hdev. MGMT now notifies
when a user performs a reset.

Suggested-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Heitor Alves de Siqueira <halves@igalia.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>