util/ifdtool: Add sklkbl to IFDv2 platforms

Currently ifdtool breaks the descriptor because it treats it as IFDv1.
This change adds it to the list of IFDv2 platforms.
Fixes boot for X11SSH-LN4F.

Fixes: 8c082e5fef ("util/ifdtool: Use -p platform name to detect IFDv2 platform and chipset")
Change-Id: I3f92b090e929336b5c18b442d1504ee1000f5594
Signed-off-by: Jan Tatje <jan@jnt.io>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56070
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/util/ifdtool/ifdtool.c b/util/ifdtool/ifdtool.c
index e99cdec..b91c90c 100644
--- a/util/ifdtool/ifdtool.c
+++ b/util/ifdtool/ifdtool.c
@@ -205,9 +205,8 @@
 		return CHIPSET_9_SERIES_WILDCAT_POINT;
 	} else if (nm == 6) {
 		return CHIPSET_C620_SERIES_LEWISBURG;
-	} else {
-		return CHIPSET_100_200_SERIES_SUNRISE_POINT;
 	}
+	return CHIPSET_PCH_UNKNOWN;
 }
 
 static enum ich_chipset ifd2_platform_to_chipset(const int pindex)
@@ -219,6 +218,8 @@
 		return CHIPSET_N_SERIES_JASPER_LAKE;
 	case PLATFORM_EHL:
 		return CHIPSET_x6000_SERIES_ELKHART_LAKE;
+	case PLATFORM_SKLKBL:
+		return CHIPSET_100_200_SERIES_SUNRISE_POINT;
 	case PLATFORM_CNL:
 		return CHIPSET_300_SERIES_CANNON_POINT;
 	case PLATFORM_TGL:
@@ -250,6 +251,7 @@
 		PLATFORM_JSL,
 		PLATFORM_EHL,
 		PLATFORM_ADL,
+		PLATFORM_SKLKBL,
 	};
 	unsigned int i;