mb/google/volteer: Implement weak function `cse_board_reset`

Since Volteer also uses the CSE Lite SKU and the cr50, it is subject
to a problem where old cr50 FW will not be able to properly detect an
SoC reset, so the reset on cold boots caused by the CSE Lite RO->RW
jump should instead get an assist from the EC, which can perform a
full cold reset.

BUG=b:162977697
TEST=Verify EC performs the cold reset

Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: Ie8ae21c203da218459d5fd30a23be23520ed0598
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44536
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Caveh Jalali <caveh@chromium.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

src/mainboard/google/volteer/mainboard.c

@@ -6,10 +6,18 @@
 #include <device/device.h>
 #include <ec/ec.h>
 #include <ec/google/chromeec/ec.h>
+#include <halt.h>
+#include <intelblocks/cse.h>
 #include <soc/gpio.h>
 #include <vendorcode/google/chromeos/chromeos.h>
 #include <variant/gpio.h>
 
+void cse_board_reset(void)
+{
+	if (!google_chromeec_ap_reset())
+		halt();
+}
+
 static void mainboard_init(struct device *dev)
 {
 	mainboard_ec_init();