selftest/cases/runtime_test: Exclude centos-9 from virgl tests

Similarly to centos 8, centos 9 doesn't support the render device we need
for this test.

(From OE-Core rev: c2be3afabf84f287c90b61ae2509728a6634fb8f)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/selftest/cases/runtime_test.py

@@ -273,7 +273,7 @@ TEST_RUNQEMUPARAMS += " slirp"
         import subprocess, os
 
         distro = oe.lsb.distro_identifier()
-        if distro and (distro in ['debian-9', 'debian-10', 'centos-7', 'centos-8', 'ubuntu-16.04', 'ubuntu-18.04'] or
+        if distro and (distro in ['debian-9', 'debian-10', 'centos-7', 'centos-8', 'centos-9', 'ubuntu-16.04', 'ubuntu-18.04'] or
             distro.startswith('almalinux') or distro.startswith('rocky')):
             self.skipTest('virgl headless cannot be tested with %s' %(distro))