intel-iot-refkit: meta-intel submodule update

* meta-intel 2275341...ca8695a (5):
  > linux-intel: use = to set LINUX_VERSION_EXTENSION
  > maintainer: Update Maintainer list
  > conf: set recipe maintainers
  > linux-yocto/4.1: Update to v4.1.39
  > linux-yocto/4.4: Update to v4.4.60

Signed-off-by: Mikko Ylinen <[email protected]>

Author: mythi