added license copy which was being done from device/linaro/pandaboard/device.mk

Change-Id: I13d8c8eac57a777c77e8a549673bdfe8a5db39be
diff --git a/graphics/omap4/system/Android.mk b/graphics/omap4/system/Android.mk
index 68d3319..a4215d6 100644
--- a/graphics/omap4/system/Android.mk
+++ b/graphics/omap4/system/Android.mk
@@ -66,4 +66,7 @@
 ALL_PREBUILT += $(libs_to_link)
 include $(BUILD_MULTI_PREBUILT)
 
+PRODUCT_COPY_FILES += \
+        device/ti/proprietary-open/graphics/omap4/license.txt:root/license.txt
+
 endif