sds: Remove dependency on the clock module

This patch removes the dependency on the clock module when
there is no need for a clock to be up and running to start
operating, as it is likely to be on mobile platforms.

Change-Id: I062941e33d81691490def1c77931dcb83308b1d7
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Signed-off-by: Chris Kay <chris.kay@arm.com>