Add RELEASE_APEX_CONTRIBUTIONS_PRIMARY_LIBS build flag

Bug: 339132327

Test: m out/soong/prebuilt_info.json
Test: manually inspect that json file
Change-Id: Ib20164c82316fe02fe04a52461e344f1dfb03b90
diff --git a/android/config.go b/android/config.go
index f6711e6..76c590a 100644
--- a/android/config.go
+++ b/android/config.go
@@ -2109,6 +2109,7 @@
 		"RELEASE_APEX_CONTRIBUTIONS_NEURALNETWORKS",
 		"RELEASE_APEX_CONTRIBUTIONS_ONDEVICEPERSONALIZATION",
 		"RELEASE_APEX_CONTRIBUTIONS_PERMISSION",
+		"RELEASE_APEX_CONTRIBUTIONS_PRIMARY_LIBS",
 		"RELEASE_APEX_CONTRIBUTIONS_REMOTEKEYPROVISIONING",
 		"RELEASE_APEX_CONTRIBUTIONS_RESOLV",
 		"RELEASE_APEX_CONTRIBUTIONS_SCHEDULING",