fix compile errors like:
"implicit declaration of function 'kvm_arm_cpu_feature_supported'";
"undefined reference to 'kvm_arm_get_one_reg'"
"undefined reference to 'kvm_arm_set_one_reg'"
"'kvmval' may be used uninitialized"
"'oldval' may be used uninitialized"
Signed-off-by: Dongxu Sun <sundongxu3@huawei.com>
