Update Qt5 to latest stable release (5.5.1)

Update Qt5 to latest stable release (5.5.1)

This patch is for updating Qt5 to latest version (5.5.1).

NOTES:
  To build Qt5.5.1, it is necessary to checkout master branch of meta-qt5
  before bitbake until AGL/AGL-repo update to ready for Qt5.5.1.

LIMITATIONS:
  - xdg-shell doesn't work because of protocol version mismatch
    between server(weston) and client(Qt5 Apps).

Change-Id: If0f959dcb394da331692ec866f388cc5e7dc2baa
Signed-off-by: Tadao Tanikawa <tanikawa.tadao@jp.panasonic.com>
Signed-off-by: Nobuhiko Tanibata <ntanibata@jp.adit-jv.com>