atlas: "system lock" the EC
atlas: "system lock" the EC

this enables the "system lock" feature in the EC.  basically, when the
EC flash is locked and and the write protect pin is asserted, some
features of the EC are disabled.  most notably, USB-PD is disabled
when running in EC-RO.

BRANCH=none
BUG=b:122571285
TEST=verified that "sysinfo" reports the EC to be locked when when
	GPIO_WP_L is high and the flash is locked
	(ectool flashprotect enable)

Change-Id: I85491573ed1c60e558e8b893553a00fbbbd77e76
Signed-off-by: Caveh Jalali <08e24a66aefda7a55ca7d73f8903e0fb16eec763@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1532347
Commit-Ready: caveh jalali <08e24a66aefda7a55ca7d73f8903e0fb16eec763@chromium.org>
Tested-by: caveh jalali <08e24a66aefda7a55ca7d73f8903e0fb16eec763@chromium.org>
Reviewed-by: Matthew Blecker <d18f4466f2802f9c78c5c14a42b8c21fdbfabfcd@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec