[ARM] 5372/1: ACS5K: Core board support for the ACS-5000

This patch provides the core board support for the Brivo Systems
LLC ACS-5000 master board for automated door/card-reader etc
management.

Signed-off-by: Daniel Silverstone <dsilvers@simtec.co.uk>
Signed-off-by: Vincent Sanders <vince@simtec.co.uk>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>