The upgrade to python3 is the final nail in the coffin for image-writer
and the goggle UI. Neither seem used or recieve patches and are based
on old versions of GTK+ so drop them, and the remaining crumbs support
pieces.
(Bitbake rev: ee7df1ca00c76f755057c157c093294efb9078d8)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>