fix: fix EDK2 binary download order

A prior change accidentally moved the logic which downloads EDK2, used
by two run configurations, from `post_tf_build` to `fetch_tf_resource`.
This causes the EDK2 binary be to downloaded after it's expected to be
used, causing a failure.

Change-Id: Ie6cefad70c278f59c7e5b3551cfe84ab10e0c9a8
Signed-off-by: Chris Kay <chris.kay@arm.com>
2 files changed