Listen to capability discovery settings in the registry

When the user changes their capability discovery settings
make the TelecomAccountRegistry aware of this immediately instead of
waiting for the PhoneAccount to be recreated another way.

Bug: 150894805
Fixes: 151172590
Test: manual, verify capability discovery is enabled/disabled correctly.
Merged-In: I20110b5d5260d41ef609974d2d66d54d60626782
Change-Id: I20110b5d5260d41ef609974d2d66d54d60626782
1 file changed