Export libgui headers from media modules

libstagefright, libmedia_ndk and libmedia_omx

Also, fix the reference to HGraphicBufferProducer in
AImageReaderWindowHandleTest.

Test: Builds

Bug: 112508112
Change-Id: I2ce0e4fd395a0c733aaf98b7397d7183c7475672
diff --git a/media/ndk/tests/AImageReaderWindowHandleTest.cpp b/media/ndk/tests/AImageReaderWindowHandleTest.cpp
index 5f11252..5b65064 100644
--- a/media/ndk/tests/AImageReaderWindowHandleTest.cpp
+++ b/media/ndk/tests/AImageReaderWindowHandleTest.cpp
@@ -27,6 +27,8 @@
 
 namespace android {
 
+using HGraphicBufferProducer = hardware::graphics::bufferqueue::V1_0::
+        IGraphicBufferProducer;
 using hardware::graphics::bufferqueue::V1_0::utils::H2BGraphicBufferProducer;
 using aimg::AImageReader_getHGBPFromHandle;