intel-iot-refkit: meta-intel submodule update

Pull in meta-intel pyro release.

* meta-intel 3afa94c...7e8f98a (10):
  > conf/machine/intel-core*: Fix WKS_FILE setting
  > libva-intel-driver: Set UPSTREAM_CHECK_GITTAGREGEX
  > CHANGELOG: add file
  > README: Update information for pyro release
  > linux-intel: Update SRCREVs
  > intel-microcode: Update to latest 20170511
  > maintainers: Re-Sort and remove duplicate
  > conf/machine/intel-core*: change WKS_FILE based on EFI_PROVIDER
  > canned-wks/systemd-bootdisk-uuid.wks: remove file
  > intel-gpu-tools: Upgrade to version 1.18

Signed-off-by: Mikko Ylinen <mikko.ylinen@linux.intel.com>

Author: mythi