dragon: DragonKeyboardFirmwareUpdater: Remove the service build target.

This CL removes DragonKeyboardFirmwareUpdater package build target from
device.mk.
Moving the build target to vendor/google/products to address the build failure
deivce of PDKs. Since DragonKeyboardFirmwareUpdater uses internal framework
library, which is not sharing with device PDKs.

Bug: 26069968
TEST=build

Change-Id: I32aa80260567a0420a0084a63f5e0ae42931c416
diff --git a/device.mk b/device.mk
index 36b08af..3db078a 100644
--- a/device.mk
+++ b/device.mk
@@ -56,8 +56,7 @@
     crash_dispatcher \
     crash_collector \
     CrashReportProvider \
-    fwtool \
-    DragonKeyboardFirmwareUpdater
+    fwtool
 
 ifeq ($(TARGET_BUILD_VARIANT),eng)
 PRODUCT_PACKAGES += \