Add a soong config variable for CitadelProvision

Bug: 373235487
Test: Presubmits
Flag: EXEMPT bugfix
Change-Id: I3033873be99890a1229861c3ed767480de9fa033
diff --git a/BoardConfig-common.mk b/BoardConfig-common.mk
index 9483aff..608e5a1 100644
--- a/BoardConfig-common.mk
+++ b/BoardConfig-common.mk
@@ -22,6 +22,7 @@
 TARGET_SOC_NAME := google
 
 USES_DEVICE_GOOGLE_GS101 := true
+$(call soong_config_set,CitadelProvision,target_soc,gs101)
 
 TARGET_ARCH := arm64
 TARGET_ARCH_VARIANT := armv8-2a