tests/avocado: drop virtio-rng from sbsa-ref tests

sbsa-ref is supposed to emulate real hardware so virtio-rng-pci
does not fit here

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
Message-Id: <20240318-sbsa-ref-firmware-update-v3-2-1c33b995a538@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
diff --git a/tests/avocado/machine_aarch64_sbsaref.py b/tests/avocado/machine_aarch64_sbsaref.py
index cbab793..259225f 100644
--- a/tests/avocado/machine_aarch64_sbsaref.py
+++ b/tests/avocado/machine_aarch64_sbsaref.py
@@ -132,10 +132,6 @@ def boot_alpine_linux(self, cpu):
             cpu,
             "-drive",
             f"file={iso_path},format=raw",
-            "-device",
-            "virtio-rng-pci,rng=rng0",
-            "-object",
-            "rng-random,id=rng0,filename=/dev/urandom",
         )
 
         self.vm.launch()
@@ -179,10 +175,6 @@ def boot_openbsd73(self, cpu):
             cpu,
             "-drive",
             f"file={img_path},format=raw",
-            "-device",
-            "virtio-rng-pci,rng=rng0",
-            "-object",
-            "rng-random,id=rng0,filename=/dev/urandom",
         )
 
         self.vm.launch()