Add API to get current firewall chain status

This commit adds ConnectivityManager#getFirewallChainEnabled to read the
current firewall chain status

Bug: 208371987
Test: m
Change-Id: I1eadb69f953af5d031cd8dabde3e1f098cf0f4df
diff --git a/bpf_progs/bpf_shared.h b/bpf_progs/bpf_shared.h
index fd449a3..85b9f86 100644
--- a/bpf_progs/bpf_shared.h
+++ b/bpf_progs/bpf_shared.h
@@ -148,6 +148,7 @@
 
 #endif // __cplusplus
 
+// LINT.IfChange(match_type)
 enum UidOwnerMatchType {
     NO_MATCH = 0,
     HAPPY_BOX_MATCH = (1 << 0),
@@ -163,6 +164,7 @@
     OEM_DENY_2_MATCH = (1 << 10),
     OEM_DENY_3_MATCH = (1 << 11),
 };
+// LINT.ThenChange(packages/modules/Connectivity/service/src/com/android/server/BpfNetMaps.java)
 
 enum BpfPermissionMatch {
     BPF_PERMISSION_INTERNET = 1 << 2,