[SettingsProvider] add missing @FlaggedAPI annotations

These new APIs were added in June (ag/23836710) before the flag system
was enabled.

BUG: 304478650
Test: builds

Change-Id: I90715ecf82c3010bb99c7d01a2d9fe56158fbbd0
diff --git a/AconfigFlags.bp b/AconfigFlags.bp
index 1fb5f34..db68ba5f 100644
--- a/AconfigFlags.bp
+++ b/AconfigFlags.bp
@@ -68,6 +68,7 @@
     ":android.tracing.flags-aconfig-java{.generated_srcjars}",
     ":android.appwidget.flags-aconfig-java{.generated_srcjars}",
     ":android.webkit.flags-aconfig-java{.generated_srcjars}",
+    ":android.provider.flags-aconfig-java{.generated_srcjars}",
 ]
 
 filegroup {
@@ -845,3 +846,16 @@
     aconfig_declarations: "android.webkit.flags-aconfig",
     defaults: ["framework-minus-apex-aconfig-java-defaults"],
 }
+
+// Provider
+aconfig_declarations {
+    name: "android.provider.flags-aconfig",
+    package: "android.provider",
+    srcs: ["core/java/android/provider/*.aconfig"],
+}
+
+java_aconfig_library {
+    name: "android.provider.flags-aconfig-java",
+    aconfig_declarations: "android.provider.flags-aconfig",
+    defaults: ["framework-minus-apex-aconfig-java-defaults"],
+}