Mark SYSTEM_CALL_STREAMING role as qualification bypassable.

This enables CTS testing of the role so that we can grant the CTS mock
app the ability to be the system call streaming app.

Test: Added new CTS test to test CallStreamingService.
Bug: 279650527
Change-Id: I3b1ed5a00d10433d3caee204b962f6b9af6f2c0e