Allow Print subsystem to work with services provided by instant app

Most functionality works, but the PrintActivity cannot directly interact
with the instant service.

As instant services should only appear in tests this functionality needs
to be enabled via shell commands.

Fixes: 79484768
Test: cts-tradefed run commandAndExit cts-instant-dev -m CtsPrintTestCases
      cts-tradefed run commandAndExit cts-dev -m CtsPrintTestCases

Change-Id: Ie4663c72b8c0f959b5d172ef28875479d120e386