Fixed build for full-eng

Previously
Traceback (most recent call last):
  File "build/tools/roomservice.py", line 153, in <module>
    repo_path = get_from_manifest(device)
NameError: name 'device' is not defined

** Don't have a product spec for: 'full'
** Do you have the right repo manifest?

Now
============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=4.0.4
TARGET_PRODUCT=full
TARGET_BUILD_VARIANT=eng
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
TARGET_ARCH_VARIANT=armv7-a
HOST_ARCH=x86
HOST_OS=linux
HOST_BUILD_TYPE=release
BUILD_ID=IMM76L
============================================

Change-Id: Ib513705aba9a7a52a971ab64102ecbe9fddfb97a