Expose some ApplicationInfo#is* methods as in-process API

Connectivity service is going to become a mainline module which
will not able to access hidden APIs. But PermissionMonitor needs
ApplicationInfo#is(Vendor|Oem|Product) APIs to know the package
partition. Thus, expose them as in-process API to support the
usage.

Bug: 170593746
Test: atest FrameworksNetTests
Change-Id: Ie4ffb2b47539786dd51b885ca93c8813d039c4da