[PATCH net-next] cpts: add missing kconfig dependency

[David Miller]

From: Richard Cochran <richardcochran at gmail.com>
Date: Mon, 26 Nov 2012 13:07:18 +0100

> The Common Platform Time Sync function of the CPSW does not depend the
> CPSW configuration option as it should. This patch fixes the issue by
> adding the dependency.
> 
> Signed-off-by: Richard Cochran <richardcochran at gmail.com>

Applied.