GF-60891: Focus is not able to move between paging control to header cli...

...ent buttons

Fixing: http://jira2.lgsvl.com/browse/GF-60891

In conventional remote control, 5 way move have no way to move out from
grid list or list without moving up to the first item.

For better usability, HE QE and UX wants to move focus between paging
control to header client buttons.

Currently scroller itself is spotlight "container" control, so we need
to move spotlight "container" from scroller to viewport of moon scroll
strategy.

DCO-1.1-Signed-Off-By: Kunmyon Choi <kunmyon.choi@lge.com>