Add syslinux-native dependency only for IA host machines.
Able to build wic image successfully for below template which
uses legacy bios(syslinux):
https://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/scripts/lib/wic/canned-wks/directdisk-gpt.wks
[YOCTO #13276]
Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
