This change provides a console command for setting,
and loading a usb serial number from flash. This
feature adds CONFIG_USB_SERIALNO, and currently only
has a useful implementation when PSTATE is present.
BUG=chromium:571477
TEST=serialno set abcdef; serialno load; reboot
BRANCH=none
Change-Id: I3b24cfa2d52d54118bc3fd54b276e3d95412d245
Signed-off-by: Nick Sanders <nsanders@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/337359
Reviewed-by: Randall Spangler <rspangler@chromium.org>