Demote message send/receive wakelock log messages to DEBUG.

To reduce logcat spam, in GnssLocationProvider class, demote
wakelock acquire/release log messages associated with message
sending/handling.

Bug: 77148339
Bug: 118837738
Test: Performed a GNSS fix and checked the logcat messages for
      wakelock messages.

Change-Id: I749609470e457ba23b7144f73b8f20c606573cbe