gps: Simplify guard makefile

* USE_DEVICE_SPECIFIC_GPS != true is implied by
  $(project-path-for,qcom-gps) == $(my-dir)
* TARGET_GPS_HAL_PATH is deprecated
* Makefile already checks for 8960, 8064, 8974, 8084, 8916, so the
  QCOM_BOARD_PLATFORMS check is redundant as well.

Change-Id: I9f831b375a33ab3aa7efc96e3b3a2a15ef4324e0
1 file changed