buildroot

imx-gpu-viv: fix compiling issues with EGL_API_FB

Just like the previous commit did:
c9ecdd2b96 gpu-viv-bin-mx6q: fix compiling issues with EGL_API_FB

Difference is that in latest package, eglvivante.h is included after
a EGL_API_FB check in eglplatform.h, giving the following error:
/.../sysroot/usr/include/EGL/eglplatform.h:146:10:
 fatal error: X11/Xlib.h: No such file or directory
 #include <X11/Xlib.h>

Also, this patch introduce IMX_GPU_VIV_FIXUP_PKGCONFIG which fixes
the pkgconfig files (for some reason default egl.pc file isn't the
same as the one for fb target).

Finally, this patch removes references to libVIVANTE which is now
replaced by libVDK.

Signed-off-by: Gary Bisson <gary.bisson@boundarydevices.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>