mb/google/guybrush: Disable EN_SPKR on init on Nipperkin and Dewatt

We don't want to enable the speaker on init. It will be enabled while
using GPIO AMP codec in depthcharge.

BUG=b:223289882
TEST=boot Nipperkin and Dewatt and then verify the devbeep and gpio
values in kernel

Signed-off-by: Yu-Hsuan Hsu <yuhsuan@google.com>
Change-Id: Id874421d7464b15be6e521576696bb97e6b22d6a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63540
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/mainboard/google/guybrush/variants/baseboard/gpio.c

@@ -82,7 +82,7 @@ static const struct soc_amd_gpio base_gpio_table[] = {
 	/* SD_AUX_RESET_L  */
 	PAD_GPO(GPIO_69, HIGH),
 	/* EN_SPKR */
-	PAD_GPO(GPIO_70, HIGH),
+	PAD_GPO(GPIO_70, LOW),
 	/* GPIO_71 - GPIO_73: Not available */
 	/* Unused TP49 */
 	PAD_NC(GPIO_74),