sm + hci: complementary functions to remove packet handler

hci: fix stack init without classic

hci: add hci_le_random_address_set to set random address. Advertisements are restarted if random address is used for advertising

hci: fix stack init with HAVE_HOST_CONTROLLER_API, send read local name only without HAVE_HOST_CONTROLLER_API

hci: postpone hci remote features query until requested by l2cap

hci: add hci_remote_features_available and use in l2cap

hci: move check for BCM controller into run function

hci: convert write page scan activity and type in to gap tasks

hci: convert write scan enable into gap task

hci: swap write page timeout with write scan enable

gap: local name, EIR data, class of device and default link policy can be updated at any time

hci: add AUTH_FLAG_RECV_IO_CAPABILITIES_REQUEST flag

hci: use bool where possible, uint16_t for sco packet size

hci: packet send functions return status

hci: use bool for can send now API functions

hci: use bool for hci_reserve_packet_buffer

hci: use bool for packet buffer reserved

sm: support Cross-Transport Key-Derivation from BR/EDR to LE LTK

sm: derive and store LE LTK from BR/EDR Link Key

gap: store remote io cap oob data flag

sm: introduce sm_send_connectionless

gap: assert pairing complete event for OOB if user does not provide OOB data

l2cap: track minimal security level

gap: send user confirmation negative reply if required security level cannot be met

hci: delete unused authentication flags