ARM i.MX: remove now unnecessary argument from mxc_timer_init

As the timer code now does a clk_get to get its clock we don't
need the struct clk argument anymore.
This also changes the alternative EPIT timer to do a clk_get.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-imx/clk-imx51-imx53.c b/arch/arm/mach-imx/clk-imx51-imx53.c
index 1e7828d..c1739f6 100644
--- a/arch/arm/mach-imx/clk-imx51-imx53.c
+++ b/arch/arm/mach-imx/clk-imx51-imx53.c
@@ -329,8 +329,7 @@
 	clk_set_rate(clk[esdhc_b_podf], 166250000);
 
 	/* System timer */
-	mxc_timer_init(NULL, MX51_IO_ADDRESS(MX51_GPT1_BASE_ADDR),
-		MX51_INT_GPT);
+	mxc_timer_init(MX51_IO_ADDRESS(MX51_GPT1_BASE_ADDR), MX51_INT_GPT);
 
 	clk_prepare_enable(clk[iim_gate]);
 	imx_print_silicon_rev("i.MX51", mx51_revision());
@@ -412,8 +411,7 @@
 	clk_set_rate(clk[esdhc_b_podf], 200000000);
 
 	/* System timer */
-	mxc_timer_init(NULL, MX53_IO_ADDRESS(MX53_GPT1_BASE_ADDR),
-		MX53_INT_GPT);
+	mxc_timer_init(MX53_IO_ADDRESS(MX53_GPT1_BASE_ADDR), MX53_INT_GPT);
 
 	clk_prepare_enable(clk[iim_gate]);
 	imx_print_silicon_rev("i.MX53", mx53_revision());