Load simulate_stylus_with_touch on touchscreen reconfiguration

Query the sysprop value when the touchscreen is reconfigured
so that the debug property can be applied at runtime.

Bug: 309036663
Test: manual, adb shell setprop debug.input.simulate_stylus_with_touch true
Change-Id: I7e59669c92783f442c3290dcf445cda2bb3f69c6