Whitelist all restricted permissions when installing the DPC.

Note that we don't have to update InstallExistingPackageTask,
as PackageManager#installExistingPackageAsUser whitelists
all restricted permissions by default.

Bug: 137917422
Test: atest InstallPackageTaskTest
Change-Id: I0e1dd38a03f054382a41358597d1d76f99bd751b
2 files changed