interfaces: Introduce vendor.qti.hardware.btconfigstore interfaces

 * Based on observing libbtconfigstore expectations.

Co-authored-by: Alexander Martinz <amartinz@shiftphones.com>
Co-authored-by: Volodymyr Zhdanov <wight554@gmail.com>
Change-Id: I8ce06f48f01aee437eb6cf801a03983edc5ddd85
8 files changed