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.

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