Made Favorites view in portrait orientation in 7" look like phone

Added two new configuration parameters in resources:
- (integer) contact_tile_column_count_in_favorites - which specifies the
  number of columns for the image thumbnails in the favorites tab
- (bool) config_use_two_panes_in_favorites - indicates whether favorites
  should be shown in two-pane mode

Bug: 6379260
Change-Id: I41100b2aee507e0b9a2a37e9149b944a4831a3e9