Add vpd 2.0 log file in chrome://system

VPD (Vital Product Data) are written into BIOS flash during factory.
It contains machine-specific information, e.g., mother board serial number,
MAC address, 3G module serial number...
Those information are important when user sends machine back to service cent

The log file is generated in (see Will commit this CL after that CL.

Change-Id: Idd73b3fecf060a458a18fc8792ca2f31e21e6ac1

TEST=Tested on Mario. VPD info show in chrome://system.

Review URL:
1 file changed
tree: 7e17b76f5a5baecd0ac9f487e4fc28919cbae0d2
  2. etc/
  3. inherit-review-settings-ok
  4. scripts/