Clean up default a.h.location.network declaration

Remove android.hardware.location from car_core_hardware.xml because
cars don't normally have this out of the box.

Also remove it from shared android.hardware.location.gps.xml because
it should not be tied to the existence of GPS on a platform.

Bug: 293561387
Test: rebuild system, inspect output of adb shell pm list features
           run atest SystemFeaturesTest#testLocationFeatures
Change-Id: I3ae67b95151ee1d876e6bcf2278aa643dd75c9ee