msm: clock-mdss-8974: Remove an init marking

The init function in the clock-mdss-8974 driver
may be called at probe time instead of just at
init time. Remove the initcall marking on this
function.

Change-Id: Iea252b70c26b745934dc6d7a48974eb123b169c0
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>