ARM: 7179/1: nomadik: localize cpu-8815 header

The symbols from cpu-8815.c were being broadcast across the
entire kernel but are only really used locally in mach-nomadik
so let's localize them.

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