ARM: 5873/1: ARM: Fix the reset logic for ARM RealView boards

Extend the patch from Philby John to the other "RealView" boards.
Rename the constants and offsets to reflect their actual functions.

Cc: Philby John <pjohn@in.mvista.com>
Signed-off-by: Colin Tuckley <colin.tuckley@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>