Disable outdated extra build configs

These tf-m-extra examples are not updated yet to use the new
build-split method correctly. Disabled them until they are updated
because they could cause failed CI runs.

Change-Id: Ica234b41475dd57df3b700f5804556d689a97451
Signed-off-by: Bence Balogh <bence.balogh@arm.com>
1 file changed