aiy-board-gadget: Migrate to the board/ build

Change-Id: I0a8ff6aded3306ecf326f196f11040443ef3a2ea
diff --git a/packages.mk b/packages.mk
index 9163edf..3e1c146 100644
--- a/packages.mk
+++ b/packages.mk
@@ -118,7 +118,6 @@
 $(call make-pbuilder-package-target,$1,$2,$3,$4,$5,bsp)
 endef
 
-$(eval $(call make-pbuilder-package-target,aiy-board-gadget,packages/aiy-board-gadget))
 $(eval $(call make-pbuilder-package-target,mendel-minimal,packages/mendel-minimal))
 $(eval $(call make-pbuilder-package-target,base-files,packages/base-files))
 $(eval $(call make-pbuilder-package-target,edgetpu-api,packages/edgetpu-api,,,binary))
diff --git a/rootfs-packages.mk b/rootfs-packages.mk
index dd6c610..66d12ad 100644
--- a/rootfs-packages.mk
+++ b/rootfs-packages.mk
@@ -15,7 +15,6 @@
 
 
 BASE_PACKAGES := \
-    aiy-board-gadget \
     base-files \
     bluetooth \
     bluez \