mb/google/rauru: Notify EC that AP is in S0

GPIO_AP_SUSPEND_L is supposed to be high in S0, and low in S3. EC uses
this pin to determine the AP power state. This pin should be set as
early as possible in bootblock.

BRANCH=rauru
TEST=Build pass, reboot pass, suspend/resume pass.
BUG=b:395737458

Signed-off-by: Wenzhen Yu <wenzhen.yu@mediatek.com>
Change-Id: I6ea56208256bb6f11fb6b0adf7627403963295bc
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86381
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yidi Lin <yidilin@google.com>

src/mainboard/google/rauru/chromeos.c

@@ -19,6 +19,7 @@ void setup_chromeos_gpios(void)
 	gpio_output(GPIO_EN_SPKR, 0);
 	gpio_output(GPIO_FP_RST_1V8_S3_L, 0);
 	gpio_output(GPIO_XHCI_INIT_DONE, 0);
+	gpio_output(GPIO_AP_SUSPEND_L, 1);
 }
 
 void fill_lb_gpios(struct lb_gpios *gpios)

src/mainboard/google/rauru/gpio.h

@@ -14,6 +14,7 @@
 #define GPIO_AP_EC_WARM_RST_REQ GPIO(EINT29)
 #define GPIO_FP_RST_1V8_S3_L	GPIO(EINT26)
 #define GPIO_AP_FP_FW_UP_STRAP	GPIO(EINT27)
+#define GPIO_AP_SUSPEND_L	GPIO(EINT38)
 #define GPIO_EN_PWR_FP		GPIO(PERIPHERAL_EN3)
 #define GPIO_BL_PWM_1V8		GPIO(DISP_PWM)