[AAPM] Add help uri

This URL is used by the Advanced Protection dialog to point users to the
AAPM settings page. The resource is empty by default and should be
overriden to get the "Learn More" link to show

Bug:389080341
Test atest GtsFeaturesTestCases
Flag: EXEMPT resource only

Change-Id: I3a9b02c33ba1366a4ca9539f41c0a7da2cac030b