wifi(interface): Add wifi debug ring buffer related interface

The debug ring buffers is a purely debug mechanism to let the driver
report debug info like connection events, power events, etc to the
framework.
The framework used to previously dump out the raw byte stream in
the bugreport and the vendors had some tools to parse out the data.
This is now being changed to provide the framework with the
internal ring buffer structs to ease parsing this data in framework
itself. This will eventually be used in the new wifilogd daemon.

Bug: 32221997
Test: ./hardware/interfaces/update-makefiles.sh
Change-Id: I2c90662cfa9d07ae6fc72198a286338dbaacbfc2