Move MidiDeviceInfo to libamidi, its only user

This removes the libmedia dependency from libamidi, and reduces
overall size.

Test: build
Change-Id: I16b62ef8288bc68a46ae9ac6318efb95fa469e4f
Merged-In: I16b62ef8288bc68a46ae9ac6318efb95fa469e4f
5 files changed