Allow certificates to be stored in the carrier app whitelist

Use CARRIER_APP_WHITELIST to store app certificate mapped to package
name (instead of just package name as we had before).

Bug: 70042722
Test: SettingsBackupTest
Test: UiccProfileTest#testParseWhitelistMapFromString() for parsing map
Change-Id: Ia0c7c364cd8154272ef62cbbf412036b4eae1b21