qcom-rng is broken for acpi

[Ernesto A. Fernández <ernesto.mnd.fernandez@xxxxxxxxx>]

Hi, I have a bug to report.

I'm getting a null pointer dereference inside qcom_rng_probe() when this
driver gets loaded. The problem comes from here:

  rng->of_data = (struct qcom_rng_of_data *)of_device_get_match_data(&pdev->dev);

because of_device_get_match_data() will just return null for acpi. It seems
that acpi was left behind by the changes in commit f29cd5bb64c2 ("crypto:
qcom-rng - Add hw_random interface support").

Thanks in advance, let me know if you need anything else.
Ernesto