Suppoting only ivi-application to get ivi_surface, not supporting wl_shell.

-The ivi-application protocol is sufficient for ivi style shell.
-Removing layer creation. This means creating a Layer and add surface of
MockNavigation to the layer by e.g. LayerManagerControl to visible it.

Signed-off-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@denso.co.jp>