Add sos_vm.h as a template in configs folder and is linked to
configs/$(CONFIG_BOARD)/sos_vm.h.
If customer need a board specific sos_vm.h, make a copy in
configs/$(CONFIG_BOARD)/ and replace the symbol link.
Tracked-On: #2291
Signed-off-by: Victor Sun <victor.sun@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
