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
1 file changed