Loading gps_debug configuration before use

Was calling this after (one of) the SUPL value injections,
now calling before.

Also masking an overly verbose related log message.

Test: Build, loaded on Marlin, GPS & Xtra delete works.
Bug: 37500417
Change-Id: I768048c8b2d2a6af97a3b4b8a059b08650d616a5