clk: emev2: Silence sparse warnings

drivers/clk/shmobile/clk-emev2.c:37:14: warning: symbol 'smu_base' was not declared. Should it be static?

Cc: Takashi Yoshii <[e-mail]>
Cc: Magnus Damm <[e-mail]>
Acked-by: Simon Horman <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/shmobile/clk-emev2.c

···
 static DEFINE_SPINLOCK(lock);
 
 /* not pretty, but hey */
-void __iomem *smu_base;
+static void __iomem *smu_base;
 
 static void __init emev2_smu_write(unsigned long value, int offs)
 {