[SettingsProvider] limit individual setting length am: eabdf5da43

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24680191

Change-Id: I1a85dbd8489878df554e9963b3beff3427f9fcbe
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>