mb/google/asurada: Allow payloads to enable USB VBUS

Configure GPIO CAM_PDN5 (AP_XHCI_INIT_DONE) as output, so that
payloads (for example depthcharge) can assert it to notify EC to enable
USB VBUS.

BUG=b:187149602
TEST=emerge-asurada coreboot
BRANCH=asurada

Change-Id: I3bf63f91b8057e35be2780024a8b398c3044729b
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54902
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/asurada/chromeos.c

@@ -16,6 +16,7 @@ void setup_chromeos_gpios(void)
 	gpio_input_pullup(GPIO_SD_CD);
 	gpio_output(GPIO_RESET, 0);
 	gpio_output(GPIO_EN_SPK_AMP, 0);
+	gpio_output(GPIO_XHCI_DONE, 0);
 }
 
 void fill_lb_gpios(struct lb_gpios *gpios)

src/mainboard/google/asurada/gpio.h

@@ -16,6 +16,8 @@
 #define GPIO_RESET	GPIO(CAM_PDN2)
 /* EN_SPK */
 #define GPIO_EN_SPK_AMP	GPIO(CAM_PDN1)
+/* AP_XHCI_INIT_DONE */
+#define GPIO_XHCI_DONE	GPIO(CAM_PDN5)
 
 void setup_chromeos_gpios(void);