[poky] [pyro][pull] Add reference to iwlwifi-8000c firmware

[avinash.reddy.palleti at intel.com]

Hi,

Reference to iwlwifi-8000c firmware is removed erroneously in below commit in pyro branch,
http://git.yoctoproject.org/cgit.cgi/poky/commit/?h=pyro&id=3e4b382c0
with this yocto build is failing in platforms where this firmware is used (intel-aero), So I am adding these lines back into recipe file.
Please review the patch and merge the same into pyro branch.

Thanks,
Avinash