Use MATCH_ANY_USER when retrieving PackageInfo.

bug: 157104172
Test: m gcar && emulator; cts-tradefed run cts -m CtsPermission2TestCases -t android.permission2.cts.PrivappPermissionsTest
Test: With a package set as <install-in user-type="FULL" />, but not SYSTEM, run: adb shell cmd package get-privapp-permissions <packagename> and get the expected output.

Change-Id: I816fc36b448856a0e0244211549b54e0a95f277e