x86_cpu_model: Add '-cpu host' test case

Signed-off-by: NYumei Huang <yuhuang@redhat.com>

qemu/tests/cfg/x86_cpu_model.cfg

@@ -12,6 +12,11 @@
         get_model_cmd = "lscpu | grep 'Model name'"
         check_flag_cmd = "lscpu | grep Flags | awk -F ':'  '{print $2}'"
     variants model:
+        - host:
+            type = boot
+            cpu_model = host
+            start_vm = yes
+            cpu_model_flags += ",check"
         - EPYC:
             flags = "movbe rdrand rdtscp fxsr_opt cr8_legacy osvw fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1 arat f16c"
             model_pattern = "AMD EPYC Processor%s"