Simplify CarSettingsIntelligence proguard rules

These rules are either redundant or unnecessary, so remove them. This
saves roughly ~800KB (~30% of the APK), largely by removing unused
Jetpack deps.

Bug: 248580093
Test: m CarSettingsIntelligence + presubmit
Change-Id: I52a3723313c2d337cd6dda8a8826d5b64bad4963