Added changes for a custom banner

This CL aims at providing binding for a module that provides a custom
banner that can be added to layout file.

Bug: b/399381227
Flag: com.android.systemui.shared.new_customization_picker_ui
Test: Tested by making sure picker builds fine after the change
Change-Id: If3a62ef762e5df8bbc66586c04c3b3442be132c7
1 file changed