fix(scp): revert "chore: bump SCP version to v2.16"

This reverts commit 669cfcf028aec36d0d32057637a6cc6d02781183.

Reason for revert: the SCP image size got increased making a number of
Juno test configs failing to boot.

Change-Id: I43a4d0cb7180bb98100ccabbcf8665dba9a750e7
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
1 file changed