Remove IS_EXTERNAL

Change-Id: I9954ef1056b2aba366209059c3cda1cc3ba71c22
diff --git a/rootfs.mk b/rootfs.mk
index 92b681c..f8947ea 100644
--- a/rootfs.mk
+++ b/rootfs.mk
@@ -16,13 +16,10 @@
 	aiy-board-audio \
 	aiy-board-tools \
 	aiy-board-wlan \
+	edgetpu-api \
 	linux-image-4.9.51-aiy \
 	uboot-imx
 
-ifeq ($(IS_EXTERNAL),)
-BSP_BASE_PACKAGES += edgetpu-api
-endif
-
 BSP_GUI_PACKAGES := \
 	imx-gpu-viv \
 	imx-gst1.0-plugin \