iopl() syscall not supported in linux-arm/arm64 so always return 0 value.
Suggested-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: Santosh Shukla <sshukla@mvista.com> Acked-by: Jan Viktorin <viktorin@rehivetech.com> Acked-by: David Marchand <david.marchand@6wind.com> Reviewed-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>