Reset cell broadcast config before enabling all channels

Before cell broadcast config service enabling all channels, it
reset all channels that were previously enabled. This will make
sure the full channel config can be pushed down to modem. This
also solved the issue that channel config not sending to modem
when SIM is swapped. Note that a hidden API is added and will
be unhide in the next Android release.

Also fixed the inconsistent/incorrect permission enforcement
for cell broadcast range enablement.

Fix: 155027085
Test: Manual
Merged-In: I8d84bff9110a62b4464067b85099ee78aec6c9fe
Change-Id: I8d84bff9110a62b4464067b85099ee78aec6c9fe