fsl-vivante-kernel-driver-handler.bbclass: Handle Vivante kernel driver provider

fsl-vivante-kernel-driver-handler.bbclass: Handle Vivante kernel driver provider

Enable the kernel to provide or not the Vivante kernel driver and
dynamically set the proper providers per machine.

The following options are supported:

  MACHINE_HAS_VIVANTE_KERNEL_DRIVER_SUPPORT

     Machine does or does not have support for the Vivante kernel
     driver, options are:

       0 - machine does not have Vivante GPU driver support
       1 - machine has Vivante GPU driver support

  MACHINE_USES_VIVANTE_KERNEL_DRIVER_MODULE

      Machine uses the Vivante kernel driver as module, options are:

       0 - enable the builtin kernel driver module
       1 - enable the external kernel module

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>