Launcher: display APP icon paged in main screen as Carrier require

Carrier require display customized APP:

  - recommened APP will be placed on the first page on main screen
  - Carrier's specific APP will be placed on the second page
  - rest and third APP will be placed on other page

Change-Id: I2e52285068012a3e99526225b99bd25365df9bec
Signed-off-by: Xiaojing Zhang <zhangx@codeaurora.org>