Fix "Clear all" tap ripple is cut off

The view parent of "Clear all" button's view parent is FooterView.
FooterView has the paddingEnd that is 8dp. The "Clar all" button's
view parent is a Framelayout with android:layout_width="match_parent".
Because the layout parameter of Framelayout tells FooterView
"match_parent" and FooterView's super class is ExpandableView doesn't
consider the FooterView's paddings, the "Clear all" button right
boundary is cut off by FooterView.

To use paddingStart + paddingEnd instead of 0 padding in the onMeasure
phase. After considerating the padding of Expandableview-self padding,
the children of ExpandableView doesn't have the wrong drawing area.

The left boundary of "Manage notifications" should align with the left
bottom round corner end of the notification list. The first charactor
of "Manage notifications" should align the any of the first charactor
of the notification. The alignment is 16dp defined in
notification_content_margin_start.

The right boundary of "Clear all" should align with the right bottom
round corner end of the notification list. The total of padding that
counted from right boundary of notification list to the right text
boundary should be 16dp defined in notification_content_margin_end.

Bug: 77631994
Test: atest SystemUITests
Change-Id: I64a3489891bee993a1a2a0fd29e8d65823a36d63