Fix includes in HardwareAPI.h to be absolute and not relative

(but using system header syntax)

Change-Id: I504c5c5330ddd1e3b3d2fb4760b0235a4fda84d8
diff --git a/include/media/hardware/HardwareAPI.h b/include/media/hardware/HardwareAPI.h
index fc0f070..a6a849d 100644
--- a/include/media/hardware/HardwareAPI.h
+++ b/include/media/hardware/HardwareAPI.h
@@ -18,8 +18,8 @@
 
 #define HARDWARE_API_H_
 
-#include <OMXPluginBase.h>
-#include <MetadataBufferType.h>
+#include <media/hardware/OMXPluginBase.h>
+#include <media/hardware/MetadataBufferType.h>
 #include <system/window.h>
 #include <utils/RefBase.h>