ARM: 6828/1: mach-ux500: delete SSP PrimeCell ID

This is redundant. The correct ID number is right there in the
hardware anyway. We will introduce a mechanism later to hard-code
this for deviant cells.

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