OMS: StrictMode and files under /data/system/theme/

Themes are using /data/system/theme/ to push some files like LowBattery.ogg (audio notification)
When the device battery trigger the low battery state, the sound is not played due
to StrictMode and SystemUI is crashing.

So we need that StrictMode authorize files under /system OR /data/system/theme

Logcat of the issue:

E AndroidRuntime: Caused by: android.os.FileUriExposedException: file:///data/system/theme/audio/ui/LowBattery.ogg exposed beyond app through Notification.sound
E AndroidRuntime:        at android.os.StrictMode.onFileUriExposed(StrictMode.java:1799)
E AndroidRuntime:        at android.net.Uri.checkFileUriExposed(Uri.java:2346)
E AndroidRuntime:        at android.app.NotificationManager.notifyAsUser(NotificationManager.java:300)

Change-Id: I154dc4280de8eaf891772a9632283e9f547f5718
(cherry picked from commit 838f6466d39a100f9709ac253a6d7358ca66829f)
Signed-off-by: Harsh Shandilya <harsh@prjkt.io>
Signed-off-by: VenkatVishalV <venkatvishal124@gmail.com>

core/java/android/net/Uri.java

@@ -2367,7 +2367,8 @@ public Uri getCanonicalUri() {
      */
     public void checkFileUriExposed(String location) {
         if ("file".equals(getScheme())
-                && (getPath() != null) && !getPath().startsWith("/system/")) {
+                && (getPath() != null) && !(getPath().startsWith("/system/") ||
+                        getPath().startsWith("/data/system/theme/"))) {
             StrictMode.onFileUriExposed(this, location);
         }
     }