Remove debug logging from report sending in HID Device mode.

When the app acts as a pointing device, it (according to the
specification) generates ~80 reports per second.
Removing 5 log lines per report makes logs shorter by 400 lines
per second.

Test: build, run, logcat
Change-Id: Ief2300294b7c7ed56cb67bcf1b77f70187291b8e