random: move virtio in a subdir

Change-Id: Idd776d6599613807c611cc6f72d8c1d2b9234946
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7337
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

ccp: driver for the RNG part of CCP on AMD

the entropy source is read every second and pushed to the PRNG.
the PCI device is tested, not the ACPI.

Change-Id: I9bb6b21c7189b28a1d8a624d83b33ff6682152dc
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5825
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

random: add a Virtio RNG module

* The default module is replaced by the Virtio RNG module when found.
* This can have the undesired effect of rendering /dev/urandom slow.
* Tested with the following QEmu command line option:
-device virtio-rng-pci,rng=rng0 -object rng-random,filename=/dev/random,id=rng0
* moved random.h to private/drivers headers.

random: add a Virtio RNG module

* The default module is replaced by the Virtio RNG module when found.
* This can have the undesired effect of rendering /dev/urandom slow.
* Tested with the following QEmu command line option:
-device virtio-rng-pci,rng=rng0 -object rng-random,filename=/dev/random,id=rng0
* moved random.h to private/drivers headers.