misc: add newlines at the end of text files

Under unix, text files should end with newlines, and not having
a newline at the EOF may cause some utilities to process these
files incorrectly.

Add the missing newlines to some of the text files in the codebase.

Signed-off-by: Tomás Agustín González Orlando <tomasagustin.gonzalezorlando@arm.com>
Change-Id: If88f7790cedb455cd3ad6d598197ebb276d57503