add modalias for testing

[Dimitri John Ledkov]

nvidia-graphics-drivers-460

[Impact]

 * To aid installer testing of the correct kernels with/without nvidia, it would be helpful to test nvidia driver installation in qemu VMs without actually needing nvidia hardware.

 * We already have `Modaliases: meta(dmi:*:pnUBUNTUQEMUTEST:*)` to test installs with oem-qemu-meta (aka certified install)

 * It would be useful to add nvidia modalias of `dmi:*:pvrUBUNTUNVIDIATEST:*` to nvidia-graphics-drivers-460

 * This way we will be able to test generic with/without nvidia; and oem with/without nvidia. By combinding pn & pvr dmi modaliases.

[Test Case]

 * Setup ubuntu qemu libvirt vm with dmi sysinfo setting product version to UBUNTUNVIDIATEST
I.e.
<sysinfo type="smbios">
  <system>
      <entry name="version">UBUNTUNVIDIATEST</entry>
  </system>
</sysinfo>
<os>
  ...
  <smbios mode="sysinfo"/>
</os>

 * Boot and execute ubuntu-drivers list

 * Observe that nvidia drivers show up as options.

[Where problems could occur]

 * Additional mod alias will be exposed in the package metadata, and whilst it will be installed it will not be loaded. It is purely an installer test interface.

[Brian Murray (brian-murray)]

The Groovy Gorilla has reached end of life, so this bug will not be fixed for that release