Replace use_context_attribution_source / check_full_attribution_source_chain flags with read-only flag

The VDM team needs the data delivery permission checks to be enabled in
trunkfood to move forward. Due to b/373966108, enabling the flags through
teamfood is a risk. Replace these runtime flags with a single compile-time
flag, which does not carry that risk.

Bug: 190657833
Test: Ran CameraPermissionTest
Flag: com.android.internal.camera.flags.data_delivery_permission_checks
Change-Id: Ic870ba644f0aee0de4e562f7ef750fcd021be24c
diff --git a/camera/camera_platform.aconfig b/camera/camera_platform.aconfig
index 4e36e01..227420c 100644
--- a/camera/camera_platform.aconfig
+++ b/camera/camera_platform.aconfig
@@ -175,16 +175,10 @@
 
 flag {
     namespace: "camera_platform"
-    name: "use_context_attribution_source"
-    description: "Use the context-provided AttributionSource when checking for client permissions"
+    name: "data_delivery_permission_checks"
+    description: "Pass the full AttributionSource chain to PermissionChecker for data delivery"
     bug: "190657833"
-}
-
-flag {
-    namespace: "camera_platform"
-    name: "check_full_attribution_source_chain"
-    description: "Pass the full AttributionSource chain to PermissionChecker"
-    bug: "190657833"
+    is_fixed_read_only: true
 }
 
 flag {