Determine if NPVC is intercepting touches from footer

In normal cases, in taps on the FooterActionsView area, we should see
NPVC#onInterceptTouchEvent called and then
FooterActionsView#onInterceptTouchEvent. However, if NPVC is
intercepting the touches, the second call won't happen.

To enable, run:
adb shell setprop log.tag.PanelView VERBOSE
adb shell setprop log.tag.FooterActionsView VERBOSE
adb shell am crash com.android.systemui

This will restart SystemUI so needs to be done before observing the
issue.

Bug: 235072946
Test: logcat
Change-Id: Ie0eaf9441162fc380ed373916a2acd824c8da930