nixos/qemu: Add virtio-rng-pci to test-driver

Otherwise AArch64 KVM guests don't have enough entropy at boot.

Changed files
+1
nixos
lib
test-driver
+1
nixos/lib/test-driver/Machine.pm
···
($self->{allowReboot} ? "" : "-no-reboot ") .
"-monitor unix:./monitor -chardev socket,id=shell,path=./shell " .
"-device virtio-serial -device virtconsole,chardev=shell " .
($showGraphics ? "-serial stdio" : "-nographic") . " " . ($ENV{QEMU_OPTS} || "");
chdir $self->{stateDir} or die;
exec $self->{startCommand};
···
($self->{allowReboot} ? "" : "-no-reboot ") .
"-monitor unix:./monitor -chardev socket,id=shell,path=./shell " .
"-device virtio-serial -device virtconsole,chardev=shell " .
+
"-device virtio-rng-pci " .
($showGraphics ? "-serial stdio" : "-nographic") . " " . ($ENV{QEMU_OPTS} || "");
chdir $self->{stateDir} or die;
exec $self->{startCommand};