cros_wp_rollout: switch to upstream writeprotect on AMD/sb600

BUG=b:236195611,b:236214660
BRANCH=none
TEST=flashrom.FirmwareTester on grunt (treeya, W25Q128.W)

Signed-off-by: Nikolai Artemiev <nartemiev@google.com>
Change-Id: I0c53b00726c1285bb44dd9e9bb52a11d53182652
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashrom/+/3752177
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Commit-Queue: Edward O'Callaghan <quasisec@chromium.org>
Tested-by: Edward O'Callaghan <quasisec@chromium.org>
diff --git a/cros_wp_rollout.c b/cros_wp_rollout.c
index 841d3e6..bce3606 100644
--- a/cros_wp_rollout.c
+++ b/cros_wp_rollout.c
@@ -26,7 +26,7 @@
 {
 #if (defined (__i386__) || defined (__x86_64__) || defined(__amd64__))
 	if (ich_generation == CHIPSET_ICH_UNKNOWN)
-		return true; /* AMD - sb600spi */
+		return false; /* AMD - sb600spi */
 	else
 		return true; /* Intel - ichspi */
 #else