Define a new sysprop ro.board.api_frozen

ro.board.api_frozen shows if ro.board.api_level is finalized.

Bug: 295269182
Test: getprop ro.board.api_frozen
Change-Id: Ib8fb762eb21e7568c8b7254b3f25741fd2eee77f
diff --git a/private/property_contexts b/private/property_contexts
index 69e4ec2..aaf6b17 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -1133,9 +1133,10 @@
 ro.product.device_for_attestation  u:object_r:build_attestation_prop:s0 exact string
 ro.product.manufacturer_for_attestation  u:object_r:build_attestation_prop:s0 exact string
 
-# GRF property for the first api level of the vendor partition
+# Vendor API level properties for the vFRC and GRF
 ro.board.first_api_level u:object_r:build_vendor_prop:s0 exact int
 ro.board.api_level       u:object_r:build_vendor_prop:s0 exact int
+ro.board.api_frozen      u:object_r:build_vendor_prop:s0 exact bool
 ro.vendor.api_level      u:object_r:build_vendor_prop:s0 exact int
 
 # Boot image build props set by /{second_stage_resources/,}boot/etc/build.prop