buildroot

gpu-viv-bin-mx6q: rename package to imx-gpu-viv

In order to be in line with new Freescale naming convention:

https://github.com/Freescale/meta-fsl-arm/commit/74c86aa9

"Graphics recipe is renamed from gpu-viv-bin-mx6q to imx-gpu-viv"

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