tests: Add capabilities data for QEMU 2.11 x86_64

We were missing these for x86_64 arch, so this is just for completeness.
Signed-off-by: NErik Skultety <eskultet@redhat.com>

tests/qemucapabilitiestest.c

@@ -174,6 +174,7 @@ mymain(void)
     DO_TEST("x86_64", "caps_2.8.0");
     DO_TEST("x86_64", "caps_2.9.0");
     DO_TEST("x86_64", "caps_2.10.0");
+    DO_TEST("x86_64", "caps_2.11.0");
     DO_TEST("x86_64", "caps_2.12.0");
     DO_TEST("x86_64", "caps_3.0.0");
     DO_TEST("aarch64", "caps_2.6.0");