/* the rc_black_addr_prefix and rc_white_addr_prefix are used to correct
* IOP issues of absolute volume feature
* We encoutered A2DP headsets/carkits advertising absolute volume but buggy.
* We would like to blacklist those devices.
* But we donot have a full list of the bad devices. So as a temp fix, we
* are blacklisting all the devices except the devices we have well tested,
* the ones in the whitelist.
*
* For now, only the rc_white_addr_prefix is used in the code while
* rc_black_addr_prefix is kept here for future long term solution.