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 <[email protected]>
Reviewed-on: http://android.intel.com:8080/99215
Reviewed-by: cactus <[email protected]>
Reviewed-by: Renganathan, Prabu <[email protected]>
Reviewed-by: Anagani, Chandra Sekhar <[email protected]>
Reviewed-by: Ernst, Eric <[email protected]>
Reviewed-by: Imberton, Guilhem <[email protected]>
Tested-by: Ng, Cheon-woei <[email protected]>
Reviewed-by: buildbot <[email protected]>
Tested-by: buildbot <[email protected]>
2 files changed