Enable nested scrolling for locale picker

This change is to make the locale picker list enable the nested
scrolling feature. It is necessay to enable this feature to be able to
work with CollapsingToolbarLayout.

Fixes: 207318265
Fixes: 213036789
Test: manual test
1. Verify the locale picker works with Activity
2. Verify the locale picker works with SettingsBaseActivity

Change-Id: Iaf90211da640cd265fc2b23dd34b3149c4406891
(cherry picked from commit fa861a6b)
Merged-In:Iaf90211da640cd265fc2b23dd34b3149c4406891