ARM: mxs: remove now unused timer_clk argument from mxs_timer_init

With old mxs clock support removed, the timer_clk argument of
mxs_timer_init is unused now, so remove it.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
diff --git a/arch/arm/mach-mxs/timer.c b/arch/arm/mach-mxs/timer.c
index 575e8fd..02d36de 100644
--- a/arch/arm/mach-mxs/timer.c
+++ b/arch/arm/mach-mxs/timer.c
@@ -244,14 +244,14 @@
 	return 0;
 }
 
-void __init mxs_timer_init(struct clk *timer_clk, int irq)
+void __init mxs_timer_init(int irq)
 {
-	if (!timer_clk) {
-		timer_clk = clk_get_sys("timrot", NULL);
-		if (IS_ERR(timer_clk)) {
-			pr_err("%s: failed to get clk\n", __func__);
-			return;
-		}
+	struct clk *timer_clk;
+
+	timer_clk = clk_get_sys("timrot", NULL);
+	if (IS_ERR(timer_clk)) {
+		pr_err("%s: failed to get clk\n", __func__);
+		return;
 	}
 
 	clk_prepare_enable(timer_clk);