Return PO or DO for POLICY_SUSPEND_PACKAGES

For suspended packages workflow we used to return PO or DO for admin
support intent, which changed as part of fixing this bug :
b/192245204 and now we are returning null. So to revert to original
behavior returning PO or DO for POLICY_SUSPEND_PACKAGES case.

Bug: 210792656
Test: atest MixedDeviceOwnerTest#testCreateAdminSupportIntent
      atest MixedProfileOwnerTest#testCreateAdminSupportIntent
      atest MixedManagedProfileOwnerTest#testCreateAdminSupportIntent
      atest DevicePolicyManagerTest#testCreateAdminSupportIntent
      atest com.android.cts.devicepolicy.MixedDeviceOwnerTest#testSuspendPackage
Change-Id: Ice96fe5eb81b9049791b060287f0aea527868539