Update firmware version to v2.4

Merged Darryl Green requested to merge github/fork/ronald-cron-arm/rc/v2.4 into master

Created by: ronald-cron-arm

Update firmware version to v2.4 and update the readme file accordingly.

Change-Id: Id619c1e0efa513a96c6c5ab6038ee1b76c0ad70d Signed-off-by: Ronald Cron ronald.cron@arm.com

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