bootstub: add VLV2 SoC detection

BZ: 96845

Add ValleyView2 SoC (i.e. Baytrail platorm) detection for bootstub.
This is needed for further VLV2 related feature enabling, e.g. BIOS style
e820 read, etc.

Change-Id: Id590de166acb01a81cc11290bf1efdd27ba82a32
Signed-off-by: Bin Gao <bin.gao@intel.com>
Reviewed-on: http://android.intel.com:8080/99215
Reviewed-by: cactus <cactus@intel.com>
Reviewed-by: Renganathan, Prabu <prabu.renganathan@intel.com>
Reviewed-by: Anagani, Chandra Sekhar <chandra.sekhar.anagani@intel.com>
Reviewed-by: Ernst, Eric <eric.ernst@intel.com>
Reviewed-by: Imberton, Guilhem <guilhem.imberton@intel.com>
Tested-by: Ng, Cheon-woei <cheon-woei.ng@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>
2 files changed