Organize header dependencies

Header files that are exported are moved to a specific place for
exporting.

Test: make cts -j123 && cts-tradefed run cts-dev -m \
CtsMediaTestCases --compatibility:module-arg \
CtsMediaTestCases:include-annotation:\
android.platform.test.annotations.RequiresDevice
Bug: 63821829

Change-Id: Ia578e3c0dd1ff157335b3a49af896acb922586e8
diff --git a/media/libmedia/MediaScannerClient.cpp b/media/libmedia/MediaScannerClient.cpp
index 9f803cb..028616b 100644
--- a/media/libmedia/MediaScannerClient.cpp
+++ b/media/libmedia/MediaScannerClient.cpp
@@ -20,8 +20,8 @@
 
 #include <media/mediascanner.h>
 
-#include "CharacterEncodingDetector.h"
-#include "StringArray.h"
+#include <media/CharacterEncodingDetector.h>
+#include <media/StringArray.h>
 
 namespace android {