ARM: 6227/1: PL022 SSP platform data for the RealViews

This adds platform data for the PL022 to the ARM RealView reference
designs, adds the necessary clock definition and fixes a badly
defined IRQ line on the PB1176.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>