watchdog: sp805_wdt depends on ARM

watchdog: sp805_wdt depends on ARM

The SP805 driver is only used by the Spear machines, and uses
writel_relaxed, which is not available on all architectures.

The dependency from CONFIG_ARM avoids compilation problems under
randomconfig when CONFIG_ARM_AMBA is enabled for x86 builds.

Signed-off-by: Alessandro Rubini <[email protected]>
Acked-by: Giancarlo Asnaghi <[email protected]>
Signed-off-by: Davide Ciminaghi <[email protected]>
Acked-by: Linus Walleij <[email protected]>
Acked-by: Viresh Kumar <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>