Add OpenGL ES3 samples to cmake build

Signed-off-by: Prabhu Sundararaj <prabhu.sundararaj@freescale.com>
Enable ES3 for i.MX6

Signed-off-by: Prabhu Sundararaj <prabhu.sundararaj@freescale.com>
Fix file modes for newly added CMakelists

Signed-off-by: Prabhu Sundararaj <prabhu.sundararaj@freescale.com>