Turn off logspam (Bluetooth)

For more information, see https://source.android.com/source/code-style#log-sparingly

Bug: 37252687
Test: development/tools/logblame/medium_idle_test
Change-Id: I8c839eff19fa0b00d1b6a04fbb554b39010884d9
(cherry picked from commit 522633f4)