KVM: selftests: Add a flag to identify AMD compatible test cases

Most of KVM x86 selftests for AMD are compatible with Hygon architecture
(but not all), add a flag "host_cpu_is_amd_compatible" to figure out
these cases.

Following test failures on Hygon platform can be fixed:

* Fix hypercall test: Hygon architecture also uses VMMCALL as guest
  hypercall instruction.

* Following test failures due to access reserved memory address regions:
  - access_tracking_perf_test
  - demand_paging_test
  - dirty_log_perf_test
  - dirty_log_test
  - kvm_page_table_test
  - memslot_modification_stress_test
  - pre_fault_memory_test
  - x86/dirty_log_page_splitting_test

Hygon CSV also makes the "physical address space width reduction", the
reduced physical address bits are reported by bits 11:6 of
CPUID[0x8000001f].EBX as well, so the existed logic is totally
applicable for Hygon processors.  Mapping memory into these regions and
accessing to them results in a #PF.

Signed-off-by: Zhiquan Li <zhiquan_li@163.com>
Link: https://patch.msgid.link/20260212103841.171459-3-zhiquan_li@163.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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