Allow adapter callback to transition state machine

For ARC++ we need to be able to have the HAL asynchronously inform
the Bluetooth adapter state machine that the adapter has been
enabled or disabled. Add ENABLED_READY and DISABLED messages to the
OnState and OffState handlers, treating them the same as BLE_TURN_ON
and BLE_TURN_OFF messages.

Based on ag/885443

Bug: 62410651 69965109
Test: Build ok
Change-Id: I94a98735d1a6fb6b105cddd94e7e1dd5e80e700c