mb/google/poppy/variants/nautilus: Use GPP_B20 to determine SKU

We would use GPP_B20 instead of board id to determine nautilus SKU.

BUG=b:80052672
BRANCH=poppy
TEST=Verified the new coreboot could determine SKU correctly

Change-Id: I1978b544eef7a184a3da191306ee32d862fa8c36
Signed-off-by: Seunghwan Kim <sh_.kim@samsung.com>
Reviewed-on: https://review.coreboot.org/27220
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/poppy/variants/nautilus/mainboard.c b/src/mainboard/google/poppy/variants/nautilus/mainboard.c
index b4ef1c2..502195e 100644
--- a/src/mainboard/google/poppy/variants/nautilus/mainboard.c
+++ b/src/mainboard/google/poppy/variants/nautilus/mainboard.c
@@ -13,9 +13,9 @@
  * GNU General Public License for more details.
  */
 
-#include <boardid.h>
 #include <baseboard/variants.h>
 #include <chip.h>
+#include <gpio.h>
 #include <device/device.h>
 #include <variant/sku.h>
 
@@ -26,7 +26,13 @@
 	if (sku_id != SKU_UNKNOWN)
 		return sku_id;
 
-	if (board_id() < 9)
+	/*
+	*  Nautilus uses GPP_B20 to determine SKU
+	*  0 - Wifi SKU
+	*  1 - LTE SKU
+	*/
+	gpio_input_pulldown(GPP_B20);
+	if (!gpio_get(GPP_B20))
 		sku_id = SKU_0_NAUTILUS;
 	else
 		sku_id = SKU_1_NAUTILUS_LTE;