EDAC, sb_edac: Add Knights Landing (Xeon Phi gen 2) support

Knights Landing is the next generation architecture for HPC market.

KNL introduces concept of a tile and CHA - Cache/Home Agent for memory
accesses.

Some things are fixed in KNL:
() There's single DIMM slot per channel
() There's 2 memory controllers with 3 channels each, however,
   from EDAC standpoint, it is presented as single memory controller
   with 6 channels. In order to represent 2 MCs w/ 3 CH, it would
   require major redesign of EDAC core driver.

Basically, two functionalities are added/extended:
() during driver initialization KNL topology is being recognized, i.e.
   which channels are populated with what DIMM sizes
   (knl_get_dimm_capacity function)
() handle MCE errors - channel swizzling

Reviewed-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Jim Snow <jim.m.snow@intel.com>
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: lukasz.anaczkowski@intel.com
Link: http://lkml.kernel.org/r/1449136134-23706-5-git-send-email-hubert.chrzaniuk@intel.com
[ Rebase to 4.4-rc3. ]
Signed-off-by: Hubert Chrzaniuk <hubert.chrzaniuk@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>