Floss: Wire MSFT API in topshim

The topshim implementation of MSFT API connects Floss daemon into
libbluetooth's btif MSFT API.

Bug: 217272837
Tag: #floss
Test: Build Floss on Linux and Chrome OS
BYPASS_LONG_LINES_REASON: Bluetooth likes 120 lines

Change-Id: Ia9656875a9048007da27deb24a4a0b58f16b86d3