Set 16K dev option as checked by default for 16KB page size

Page agnostic targets use 16KB pages by default. Set the developer
option for 16KB enabled when booted with 16KB page size.

Bug: 303280163
Bug: 295035851
Test: m Settings && adb install -r $ANDROID_PRODUCT_OUT/system_ext/priv-app/Settings/Settings.apk
Change-Id: I01457ce3003ea884c7d1e47aca6b85aab341aa24