util/ifdtool: Add Xeon SP Lewisburg PCH platform support under IFDv2

After commit 8c082e5fe (util/ifdtool: Use -p platform name
to detect IFDv2 platform and chipset) w/o this xeon_sp/cpx would be
detected as IFDv1 and see build error.

Fixes: 8c082e5fe ("util/ifdtool: Use -p platform name to detect IFDv2 platform and chipset")
Change-Id: I444e7d35a85d9d42fc25d654e57386f38cf1ec85
Signed-off-by: Johnny Lin <johnny_lin@wiwynn.com>
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55745
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/util/ifdtool/ifdtool.c b/util/ifdtool/ifdtool.c
index 923f77f..e99cdec 100644
--- a/util/ifdtool/ifdtool.c
+++ b/util/ifdtool/ifdtool.c
@@ -226,6 +226,8 @@
 		return CHIPSET_500_600_SERIES_TIGER_ALDER_POINT;
 	case PLATFORM_ICL:
 		return CHIPSET_400_SERIES_ICE_POINT;
+	case PLATFORM_LBG:
+		return CHIPSET_C620_SERIES_LEWISBURG;
 	default:
 		return CHIPSET_PCH_UNKNOWN;
 	}
@@ -242,6 +244,7 @@
 	static const int ifd_2_platforms[] = {
 		PLATFORM_GLK,
 		PLATFORM_CNL,
+		PLATFORM_LBG,
 		PLATFORM_ICL,
 		PLATFORM_TGL,
 		PLATFORM_JSL,
@@ -1625,6 +1628,7 @@
 	       "                                         adl    - Alder Lake\n"
 	       "                                         aplk   - Apollo Lake\n"
 	       "                                         cnl    - Cannon Lake\n"
+	       "                                         lbg    - Lewisburg PCH\n"
 	       "                                         ehl    - Elkhart Lake\n"
 	       "                                         glk    - Gemini Lake\n"
 	       "                                         icl    - Ice Lake\n"
@@ -1868,6 +1872,8 @@
 				platform = PLATFORM_APL;
 			} else if (!strcmp(optarg, "cnl")) {
 				platform = PLATFORM_CNL;
+			} else if (!strcmp(optarg, "lbg")) {
+				platform = PLATFORM_LBG;
 			} else if (!strcmp(optarg, "ehl")) {
 				platform = PLATFORM_EHL;
 			} else if (!strcmp(optarg, "glk")) {