fix(rss): remove null-terminator from RSS metadata

Remove the null-terminator of the string-like data items
from the RSS measurement's metadata. The 'version' and
'sw_type' items have an associated length value which
should not include a null-terminator when storing the
measurement.

Change-Id: Ia91ace2fff8b6f75686dd2e1862475268300bbdb
Signed-off-by: David Vincze <david.vincze@arm.com>
2 files changed