Floss: return codec format instead of codec ids on device connection

This CL modifies the structure |HfpCodecCapability| so that it
encapsulates information of the preferred codec and its available coding
formats.

Bug: 321180937
Test: m Bluetooth
Flag: EXEMPT floss only changes
Change-Id: I7e422d714750a3a44c78d72ab499143f2ad21393