Remove CONNECTIVITY_INTERNAL permission

After check the usage of those apps who declared
CONNECTIVITY_INTERNAL permission, they don't access any API which
protected by CONNECTIVITY_INTERNAL. And CONNECTIVITY_INTERNAL
has been removed from their AndroidManifest.xml. So remove the
redudant permission from privapp-permissions-platform.xml.

Bug: 32963470
Test: build, flash, boot to home w/o any permission problem.
Change-Id: I3f31d16163e359b0b16f06129452a758ea149fc1