mb/google/poppy/variants/nami: Invert FP MCU wake signal

GPP_D6 needs to be inverted to enter S0ix because FPMCU_INT_L is
active low.  Keeps device awake otherwise.

BUG=b:119447525, b:115706071
BRANCH=Nami
TEST=Run powerd_dbus_suspend from kernel and make sure see DUT drop into
     S0ix in the EC console.

Change-Id: Iad5df124e2439bbdc078d6a33f8d0510d25ecf6f
Signed-off-by: Shelley Chen <shchen@google.com>
Reviewed-on: https://review.coreboot.org/29650
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/poppy/variants/nami/gpio.c

@@ -426,7 +426,7 @@ static const struct pad_config fpmcu_gpio_table[] = {
 	/* D5  : ISH_I2C0_SDA ==> FPMCU_BOOT0 */
 	PAD_CFG_GPO(GPP_D5, 0, DEEP),
 	/* D6  : ISH_I2C0_SCL ==> FPMCU_INT_L */
-	PAD_CFG_GPI_IRQ_WAKE(GPP_D6, 20K_PU, DEEP, LEVEL, NONE),
+	PAD_CFG_GPI_IRQ_WAKE(GPP_D6, 20K_PU, DEEP, LEVEL, INVERT),
 	/* D17 : DMIC_CLK1 ==> NC */
 	PAD_CFG_NC(GPP_D17),
 };