Make Reset Wi-Fi, mobile & bluetooth scrollable

After setting both font size and display size to largest and enabling
collapsing toolbar, the content in this page will be out of screen
and be unable to scroll. Updating ScrollView to NestedScrollView can fix
this kind of issue since ScrollView can't work with CoordinatorLayout.

Bug: 178458729
Test: visual verified
1) Set font size and display size to largest
2) Navigate to Settings -> System -> Reset options -> Reset Wi-Fi mobile
& bluetooth
3) Observe and check if the content area is able to scroll.

Change-Id: I63451b99c6caa9283a45499e1374a58ccc224bfb