Consider input device signal in desktop-first switch

This CL lets the controller use an input device signal to determine the
display windowing mode.
If any mouse like device is connected to the device, the device goes to
desktop-first mode.

Flag: com.android.window.flags.form_factor_based_desktop_first_switch
Bug: 400645703
Test: DesktopDisplayModeControllerTest
Change-Id: Iaf5f080a28647efc54f6084a5d2f11dc6525cd79