Ignore incorrect NewApi Lint warning for ENTERPRISE_CONTENT_URI

ag/20580387 is changing a SystemAPI method to public API, and the
linter cannot currently handle that. Adding a suppression until
b/193460475 is resolved.

Test: m out/soong/.intermediates/packages/modules/Bluetooth/android/app/Bluetooth/android_common/lint/lint-report.xml
Bug: 240954287
Tag: #refactor
Sponser: liahav@

Ignore-AOSP-First: need to merge this with the other changes. Will
merge into AOSP manually after (unless b/193460475 is resolved).

Change-Id: Ia72f4408cbf704bede00d738f4d98332a550b816