Unify permission checking for Netd binder service

PERM_CONNECTIVITY_INTERNAL is deprecated.
Use PERM_NETWORK_STACK instead. Also some trivial cleanup.

Bug: 150749456
Test: atest
Merged-In: I93b6bca3e71b4ee82e393c5048f2783b945bb3c4
(cherry picked from commit 09c929fdff41acab6d97cf5d07a35dd9b76404cb)

Change-Id: I9b6e895c59d893ac68a4783a770b378345c3444f
1 file changed