Move libmediandk and libcamera2ndk headers

Move libmediandk and libcamera2ndk headers into their module
and export them from there.  Also move them to the same path
relative to the export as used in the NDK, media/ for
libmediandk and camera/ for libcamera2ndk.

Test: builds
Change-Id: I0b424e0e48bfb5e2b762694a97d799de08f5dda3
(cherry picked from commit 7e8d4ba5887affda749978d787b898bf31fda729)
diff --git a/camera/ndk/NdkCaptureRequest.cpp b/camera/ndk/NdkCaptureRequest.cpp
index 7c37955..5b4c180 100644
--- a/camera/ndk/NdkCaptureRequest.cpp
+++ b/camera/ndk/NdkCaptureRequest.cpp
@@ -21,7 +21,7 @@
 #include <utils/Log.h>
 #include <utils/Trace.h>
 
-#include "NdkCaptureRequest.h"
+#include <camera/NdkCaptureRequest.h>
 #include "impl/ACameraMetadata.h"
 #include "impl/ACaptureRequest.h"