Remove qtaglextras as it has been moved to the
meta-agl-profile-graphical-qt5 layer in meta-agl. This is required
to fix building the cluster demo SDK now that qtaglextras has been
added to packagegroup-qt5-toolchain-target.
Bug-AGL: SPEC-2484
Change-Id: I2037e2637edb39a1d1e7aa43243aa5000e715364 Signed-off-by: Scott Murray <scott.murray@konsulko.com>