Revert "build: add DTB to build artifacts"

This reverts commit 439dc109838685f1e953edb023a9299fe3cf4036.

Change-Id: I874065fc7e9c56223987de2d22b54ec3f4eadfff
diff --git a/build/tasks/dtb.mk b/build/tasks/dtb.mk
index 54206df..5a8d151 100644
--- a/build/tasks/dtb.mk
+++ b/build/tasks/dtb.mk
@@ -13,11 +13,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# Make a zipfile containing the DTB if it has been built but not appended
-# to the kernel image already.
+# Make a zipfile containing the arm emulator's kernel.dtb
 
-ifdef TARGET_KERNEL_DTB
-ifndef TARGET_KERNEL_DTB_APPEND
+ifeq ($(TARGET_DEVICE), brilloemulator_arm)
 
 emul_name := $(TARGET_PRODUCT)
 ifeq ($(TARGET_BUILD_TYPE), debug)
@@ -38,4 +36,3 @@
 $(call dist-for-goals, dist_files, $(EMUL_ZIP))
 
 endif
-endif