ARM: imx: move clk_prepare() out from mxc_restart()

It's inappropriate to call clk_prepare() in mxc_restart(), because the
restart routine could be called in atomic context.  Move clk_get() and
clk_prepare() into mxc_arch_reset_init() and only have the atomic part
clk_enable() be called in mxc_restart().

As a result, mxc_arch_reset_init() needs to be called after clk gets
initialized.

While there, it also changes printk(KERN_ERR ...) to pr_err() and adds
__init annotation for mxc_arch_reset_init().

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/mach-imx/mm-imx27.c

@@ -66,7 +66,6 @@ void __init mx27_map_io(void)
 void __init imx27_init_early(void)
 {
 	mxc_set_cpu_type(MXC_CPU_MX27);
-	mxc_arch_reset_init(MX27_IO_ADDRESS(MX27_WDOG_BASE_ADDR));
 	imx_iomuxv1_init(MX27_IO_ADDRESS(MX27_GPIO_BASE_ADDR),
 			MX27_NUM_GPIO_PORT);
 }
@@ -82,6 +81,7 @@ static const struct resource imx27_audmux_res[] __initconst = {
 
 void __init imx27_soc_init(void)
 {
+	mxc_arch_reset_init(MX27_IO_ADDRESS(MX27_WDOG_BASE_ADDR));
 	mxc_device_init();
 
 	/* i.mx27 has the i.mx21 type gpio */