Set the footer on the NSSL in the binder.

Turns out this part got lost on the way in the previous CL...

Test: running e2e tests in another CL with the flag on
Bug: 293167744
Flag: ACONFIG com.android.systemui.notifications_footer_view_refactor DEVELOPMENT
Change-Id: I9f935a4c59923044a3beafaacdb6b3a9ced79035