Build: Simplify TF-M build output logs

TF-M build output log can be simplified by hiding the details of
manifest generation and showing the summaries.

Signed-off-by: Jianliang Shen <jianliang.shen@arm.com>
Change-Id: I42d6b42172a2f0cc1400e16360661a319e76fac4
1 file changed