Move Nearby flags to common and add specify it in java_sdk_library

Bug: 324993608
Test: TH
Change-Id: I1dc79353e9bae3d977db88e572e871cd459fc7fc

common/FlaggedApi.bp

@@ -21,3 +21,11 @@ aconfig_declarations {
     srcs: ["flags.aconfig"],
     visibility: ["//packages/modules/Connectivity:__subpackages__"],
 }
+
+aconfig_declarations {
+    name: "nearby_flags",
+    package: "com.android.nearby.flags",
+    container: "system",
+    srcs: ["nearby_flags.aconfig"],
+    visibility: ["//packages/modules/Connectivity:__subpackages__"],
+}

common/nearby_flags.aconfig

@@ -0,0 +1,9 @@
+package: "com.android.nearby.flags"
+container: "system"
+
+flag {
+    name: "powered_off_finding"
+    namespace: "nearby"
+    description: "Controls whether the Powered Off Finding feature is enabled"
+    bug: "307898240"
+}

framework-t/Android.bp

@@ -197,6 +197,7 @@ java_sdk_library {
     ],
     aconfig_declarations: [
         "com.android.net.flags-aconfig",
+        "nearby_flags",
     ],
 }