Remove or reduce visibility of deprecated methods

- Fix additional getInt() path, restores the location settings screen
functionality.

- Should fix "unresolved link" build breakages in
git_klp-dev-plus-aosp-without-vendor, which is much more persnickety than
klp-dev for some reason.

- Add warning that we may add additional location modes in the future.

- Finish fix for b/10461763 and b/10461474

Change-Id: Id7155e3a0d7526a377d446018ef3bdb057bad3a6