BroadcastQueue: fix class typo of next receiver

nextReceiver should be cast to ResolveInfo
instead of ActivityInfo since it's ResolveInfo
that is pushed into List r.receivers.
Otherwise nextReceiver will always be null
as there is no ActivityInfo in r.receivers.

Signed-off-by: Leavitt Zhang <leavittz@nvidia.com>
Change-Id: Iea3a720e6d7296fedff318643a1b4f5b9fce900c