linux-yocto/3.14: aufs, edgerouter config and -rt

Updating the 3.14 SRCREVs to import the following changes:

  - enable AUFS: a missing Kbuild patch was preventing aufs from compiling
  - edgerouter: remove RTC configuration options
  - preempt-rt recipe. The patch for 3.14 is availble, so we populate the recipe.

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