Add overriding method of a default method to signature files

Currently, the signature file elides overrides of a default method,
as they are not essential for the compilation of the stubs.
However, in some scenarios, the overrides of a default method may be
essential for the compilation of the reverse dependency of the stubs.
In the scenario seen below:
```
// API
interface ApiInterface {
    public default void bar() {};
}
class ApiClass implements AnotherParentInterface{
    public void bar() {}
}

// App depending on the API
interface AppInterface {
    public void bar();
}
public class AppClass extends ApiClass implements AppInterface {
}
```
Removal of `ApiClass.bar()` will lead to not overriding an abstract method
`AppInterface.bar()` compilation error in `AppClass`.
Therefore, this change adds the overrides of a default method to the
signature files.

Test: checkapi
Bug: 299366704
Change-Id: I212bd9aa895088fa9de33c7e3521453dea30c350
diff --git a/test-mock/api/current.txt b/test-mock/api/current.txt
index f61cce6..daaab33 100644
--- a/test-mock/api/current.txt
+++ b/test-mock/api/current.txt
@@ -156,6 +156,7 @@
     method @Deprecated public int getInt(int);
     method @Deprecated public long getLong(int);
     method @Deprecated public android.net.Uri getNotificationUri();
+    method @Deprecated public java.util.List<android.net.Uri> getNotificationUris();
     method @Deprecated public int getPosition();
     method @Deprecated public short getShort(int);
     method @Deprecated public String getString(int);
@@ -179,6 +180,7 @@
     method @Deprecated public android.os.Bundle respond(android.os.Bundle);
     method @Deprecated public void setExtras(android.os.Bundle);
     method @Deprecated public void setNotificationUri(android.content.ContentResolver, android.net.Uri);
+    method @Deprecated public void setNotificationUris(android.content.ContentResolver, java.util.List<android.net.Uri>);
     method @Deprecated public void unregisterContentObserver(android.database.ContentObserver);
     method @Deprecated public void unregisterDataSetObserver(android.database.DataSetObserver);
   }