Revert "Revert "Only allow root/system UIDs to send broadcast to unexported receiver""

This reverts commit 391263ceb4.

Reason for revert: Affected receivers have been updated to remove the RECEIVER_NOT_EXPORTED flag in ag/17597116 and ag/17575182; all other receivers using this flag are either expecting the broadcast from the local app or a protected-broadcast sent from the system UID.

Bug: 225999840
Test: atest ContextTest
Test: atest CtsSensorTestCases
Test: atest CtsAppExitTestCases
Test: atest UiTranslationManagerTest
Test: atest CtsAutoFillServiceTestCases:android.autofillservice.cts.dropdown.LoginActivityTest
Test: atest AccessibilityWindowReportingTest
Test: atest AndroidCarApiTest
Test: atest BugReportAppTest
Test: atest CarSecurityPermissionTest
Test: atest CarServiceTest
Test: atest CarServiceUnitTest
Test: atest com.android.car.obd2.test
Test: atest SampleCustomInputServiceTest
Change-Id: Ifd76ed5d84de43eeb8f5215d07e90b0952673180

services/core/java/com/android/server/am/BroadcastQueue.java

@@ -869,9 +869,9 @@ public final class BroadcastQueue {
 
         // Ensure that broadcasts are only sent to other apps if they are explicitly marked as
         // exported, or are System level broadcasts
-        if (!skip && !filter.exported && !Process.isCoreUid(r.callingUid)
-                && filter.receiverList.uid != r.callingUid) {
-
+        if (!skip && !filter.exported && mService.checkComponentPermission(null, r.callingPid,
+                r.callingUid, filter.receiverList.uid, filter.exported)
+                != PackageManager.PERMISSION_GRANTED) {
             Slog.w(TAG, "Exported Denial: sending "
                     + r.intent.toString()
                     + ", action: " + r.intent.getAction()