remove jni.h include from IOMX.h

jni.h is not used in IOMX.h and is not available in pdk builds,
remove it.

Change-Id: I9bc8fd70f617942712d9f684c6fc927bf18be753
diff --git a/include/media/IOMX.h b/include/media/IOMX.h
index a295e9a..be1b2fc 100644
--- a/include/media/IOMX.h
+++ b/include/media/IOMX.h
@@ -26,8 +26,6 @@
 #include <OMX_Core.h>
 #include <OMX_Video.h>
 
-#include "jni.h"
-
 namespace android {
 
 class IMemory;