qtbase,qtwebkit,meta-toolchain-qt5: Removing from meta-mentor

Removing qtbase,qtwebkit,meta-toolchain-qt5 and adding these
changes to meta-qt5-mel.

Signed-off-by: Sujith H <Sujith_Haridasan@mentor.com>
Merge pull request #208 from sharidas/remove-qt-bits

qtbase,qtwebkit,meta-toolchain-qt5: Removing from meta-mentor