Disable large-ish parcel logging.

This logging was originally added to track down very large log
messages that were causing Binder transactions to fail.  We fixed
a handful of bugs that could have been causing this over in 32575987,
so this logging should no longer be needed in live builds.  (In fact,
this logging is being triggered often enough to push other important
debugging information out of logs.)

Test: builds, boots
Bug: 36372780
Change-Id: I640192fbec35693673a2f22b7a82ce54f27937da