Remove FlpHardwareProvider

After Treble's FLP merge into GNSS HAL, the FlpHardwareProvider is just
an empty shell. Removing FusedLocation and/or Flp + Hardware classes
altogether.

Bug: 35726697
Test: m -j
Test: Open Google Map and then walk around. The dot moves as I walk.

Merged-In: I7f413e38b57424e8ebb9d7d14d94f145a48d10f8
Change-Id: I7f413e38b57424e8ebb9d7d14d94f145a48d10f8
(cherry picked from commit 4cc3a1c0)