Make onPackage[Added|Removed] as non-public methods

In the past, CS would receive package add/remove intent and notify
PermissionMonitor by onPackage[Added|Removed] method.
Now, PermissionMonitor receives those intents itself, so CS will
not call these two methods anymore. Thus, these two methods do not
need to be public, make them as package private methods.

Bug: 232048835
Test: atest FrameworksNetTests CtsNetTestCases
Change-Id: I516edd1e900d7515bf383eeab2492eace97d780a
2 files changed