KVM: selftests: Test all possible "invalid" PERF_CAPABILITIES.LBR_FMT vals

Test all possible input values to verify that KVM rejects all values
except the exact host value.  Due to the LBR format affecting the core
functionality of LBRs, KVM can't emulate "other" formats, so even though
there are a variety of legal values, KVM should reject anything but an
exact host match.

Suggested-by: Like Xu <like.xu.linux@gmail.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>