Place nuplayer headers in a subdirectory

consumers will now say <nuplayer.xxx.h>

Bug: 201944383
Test: build
Change-Id: I0b46b1d1e08c15bbfd422162895b9838dcf071ca
diff --git a/media/libmediaplayerservice/MediaPlayerService.cpp b/media/libmediaplayerservice/MediaPlayerService.cpp
index c7a7a3a..3b5e1e2 100644
--- a/media/libmediaplayerservice/MediaPlayerService.cpp
+++ b/media/libmediaplayerservice/MediaPlayerService.cpp
@@ -82,7 +82,7 @@
 #include "MediaPlayerFactory.h"
 
 #include "TestPlayerStub.h"
-#include "nuplayer/NuPlayerDriver.h"
+#include <nuplayer/NuPlayerDriver.h>
 
 
 static const int kDumpLockRetries = 50;