x86/cpuid: fix missing feature set bits

This one was accidently removed with commit
bb0300dcSigned-off-by: NAndre Przywara <andre.przywara@amd.com>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

target-i386/cpuid.c

@@ -754,6 +754,7 @@ int cpu_x86_register (CPUX86State *env, const char *cpu_model)
     env->pat = 0x0007040600070406ULL;
     env->cpuid_ext_features = def->ext_features;
     env->cpuid_ext2_features = def->ext2_features;
+    env->cpuid_ext3_features = def->ext3_features;
     env->cpuid_xlevel = def->xlevel;
     env->cpuid_kvm_features = def->kvm_features;
     {