Remove obsolete subdirs and optional_subdirs

I was looking for documentation of what these mean, but discovered
that these attributes have been obsolete for years.

Test: m
Change-Id: Ifcf47e99d22b1546780968d1030f835173612a27

Android.bp

@@ -1029,22 +1029,6 @@ aidl_interface {
     },
 }
 
-
-subdirs = [
-    "cmds/*",
-    "core/*",
-    "libs/*",
-    "media/*",
-    "proto",
-    "tools/*",
-    "native/android",
-    "native/graphics/jni",
-]
-
-optional_subdirs = [
-    "core/tests/utiltests/jni",
-]
-
 // TODO(b/77285514): remove this once the last few hidl interfaces have been
 // updated to use hwbinder.stubs.
 java_library {

libs/usb/Android.bp

@@ -19,5 +19,3 @@ java_sdk_library {
     srcs: ["src/**/*.java"],
     api_packages: ["com.android.future.usb"],
 }
-
-subdirs = ["tests/*"]

libs/usb/tests/AccessoryChat/Android.bp

@@ -1,4 +1,3 @@
-subdirs = ["accessorychat"]
 //
 // Copyright (C) 2011 The Android Open Source Project
 //

media/jni/Android.bp

@@ -160,8 +160,3 @@ cc_library_shared {
         "-Wunreachable-code",
     ],
 }
-
-subdirs = [
-    "audioeffect",
-    "soundpool",
-]

media/native/Android.bp

@@ -1 +0,0 @@
-subdirs = ["*"]