Make hwbinder stubs use a filegroup for srcs

This allow moving the droidstubs definitions into a subdirectory while
still being able to access the source files.

Bug: 271563074
Test: m
Change-Id: I6e57c2df6e274359554d1cb8014f9d8ab86b207a

StubLibraries.bp

@@ -575,20 +575,7 @@ droidstubs {
 
 droidstubs {
     name: "hwbinder-stubs-docs",
-    srcs: [
-        "core/java/android/os/HidlSupport.java",
-        "core/java/android/os/HidlMemory.java",
-        "core/java/android/os/HwBinder.java",
-        "core/java/android/os/HwBlob.java",
-        "core/java/android/os/HwParcel.java",
-        "core/java/android/os/IHwBinder.java",
-        "core/java/android/os/IHwInterface.java",
-        "core/java/android/os/DeadObjectException.java",
-        "core/java/android/os/DeadSystemException.java",
-        "core/java/android/os/NativeHandle.java",
-        "core/java/android/os/RemoteException.java",
-        "core/java/android/util/AndroidException.java",
-    ],
+    srcs: [":hwbinder-stubs-srcs"],
     libs: ["framework-annotations-lib"],
     installable: false,
     sdk_version: "core_platform",

core/java/Android.bp

@@ -293,6 +293,28 @@ filegroup {
     ],
 }
 
+filegroup {
+    name: "hwbinder-stubs-srcs",
+    srcs: [
+        "android/os/HidlSupport.java",
+        "android/os/HidlMemory.java",
+        "android/os/HwBinder.java",
+        "android/os/HwBlob.java",
+        "android/os/HwParcel.java",
+        "android/os/IHwBinder.java",
+        "android/os/IHwInterface.java",
+        "android/os/DeadObjectException.java",
+        "android/os/DeadSystemException.java",
+        "android/os/NativeHandle.java",
+        "android/os/RemoteException.java",
+        "android/util/AndroidException.java",
+    ],
+    visibility: [
+        "//frameworks/base",
+        "//frameworks/base/api",
+    ],
+}
+
 cc_defaults {
     name: "incremental_default",
     cflags: [