Future versions of Mesh will introduce new advertising packets, which
do not fit in the limited and rigid filtering currently used. This minor
rewrite allows registering and receiving of *any* AD types, including
the filtering on multiple octets of the incoming AD parts.
This introduces a chain of callbacks to indicate whether mesh io
is initialized and mesh network is ready to use.
This fixes the reported situation when the receive callbacks
were setup before the HCI was fully initialized. In other words,
BT_HCI_CMD_LE_SET_SCAN_PARAMETERS was called before BT_HCI_CMD_RESET
and, as the result, the callback issueing BT_HCI_CMD_LE_SET_SCAN_ENABLE
command was not called.
This patch separates 'mesh' module from 'mesh_io', particularly
regarding configuration and initialization.
Main code is no longer aware of MGMT and HCI usage - querying available
HCI interfaces now happens in mesh-io-generic.
MGMT code is now extracted into mesh-mgmt module, which mesh-io-generic
uses to query interfaces.
