qemu: cpuid: hyperv max supported CPUID value test

Chapters 3.3/3.4 in Hypervisor Top-Level Functional
  Specification 2.0A: Windows Server 2008 R2

CPUID.0x40000000.EAX
Signed-off-by: NIgor Mammedov <imammedo@redhat.com>

qemu/tests/cfg/qemu_cpu.cfg

@@ -183,6 +183,12 @@
                                 - def:
                                     value = "4294967295"
                                     flags = "hv_relaxed"
+                        - max_leaf:
+                            test_type = "cpuid_reg_test"
+                            reg = "eax"
+                            leaf = "0x40000000"
+                            value = "1073741829"
+                            flags = "hv_relaxed"
                 - custom:
                     # the checks below will be run without setting the CPU model
                     # explicitly. they can be repeated for each known CPU model