mb/google/brya/var/kano: Enable stylus pen power

Set GPP_D16 (PEN_PWR_EN) to output high.

BUG=b:195853169
TEST=build pass.

Signed-off-by: David Wu <david_wu@quanta.corp-partner.google.com>
Change-Id: I25b6d1a40ed0939b303a03984cb0087fb6cab4d7
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60449
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/mainboard/google/brya/variants/kano/gpio.c

@@ -36,6 +36,8 @@ static const struct pad_config override_gpio_table[] = {
 	PAD_NC(GPP_D7, NONE),
 	/* D8  : SRCCLKREQ3# ==> NC */
 	PAD_NC(GPP_D8, NONE),
+	/* D16 : ISH_UART0_CTS# ==> PEN_PWR_EN */
+	PAD_CFG_GPO(GPP_D16, 1, DEEP),
 	/* D17  : UART1_RXD ==> APU_PEN_DETECT_ODL */
 	PAD_CFG_GPI_SCI(GPP_D17, NONE, DEEP, EDGE_SINGLE, NONE),
 	/* D18 : UART1_TXD ==> NC */