Since 4ee3cf2b5a profiles with alternative vendor names may appear
multiple times in `tmp/.targetinfo` or `.targetinfo` (for
ImageBuilders).
The `target-metadata.pl` script adds these profiles then twice to
`PROFILE_NAMES` and the ImageBuilder show the profile twice when running
`make info`.
This patch removes duplicate profile IDs and only adds them once to
`.profiles.mk`.
Signed-off-by: Paul Spooren <mail@aparcar.org>