package/freescale-imx/imx-gpu-viv: install Vendor ICDs file (Vivante.icd)

Without this file, the clinfo binary provided by the package doesn't
detect the opencl support.

Fixes:
https://github.com/boundarydevices/buildroot-external-boundary/issues/5



Signed-off-by: Romain Naour <romain.naour@smile.fr>
Cc: Gary Bisson <gary.bisson@boundarydevices.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>