Load IA resolver settings from resolver package

Changes the logic of getEphemeralResolverSettingsLPr() to resolve
a settings component in any of the packages whitelisted to provide
the instant apps installer.

Test: Boots

Bug: 36840581
Change-Id: Iac5e3dfa2cb97a630092212322f9c983c2d29926
(cherry picked from commit d4310934)