MIDI: Remove logspam

There is logspam from MidiService even when MIDI is not used.
When a user starts or unlocks, every installed package creates logs.
This ends creating hundreds lines of logspam.

We can remove these logs as they don't provide much value.

Bug: 304842970
Test: see bug for repro steps
Change-Id: Iadb8b542ecbef56e2370cabf94acc9bd12e8fc9f