clk: don't export static symbol

clk: don't export static symbol

The semantic patch that fixes this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
type T;
identifier f;
@@

static T f (...) { ... }

@@
identifier r.f;
declarer name EXPORT_SYMBOL_GPL;
@@

-EXPORT_SYMBOL_GPL(f);
// </smpl>

Signed-off-by: Julia Lawall <[email protected]>
Fixes: 035a61c314eb "clk: Make clk API return per-user struct clk instances"
Signed-off-by: Stephen Boyd <[email protected]>