linux-yocto/4.1/4.4: -stable updates and configuration changes

linux-yocto/4.1/4.4: -stable updates and configuration changes

Updating the 4.4 kernel to v4.4.18 and the 4.1 kernel to v4.1.30.

We also tweak the configuration with the following commits to remove
warnings being generated from the 4.4 kernel (due to options being
dropped from the final .config):

  features: Create mfd-intel-lpss feature and use where appropriate
  features/iio: Set IIO_BUFFER_CB to =m instead of =y
  features: Add 6lowpan feature and add it where necessary

Tested on qemux86, qemuppc, qemumips and qemuarm.

(From OE-Core rev: 18c6fb387aa6a15de514030c4a7c04dac9c68869)

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>