arm: zynq: Move slcr initialization to separate file

Create separate slcr driver instead of polluting common code.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/mach-zynq/common.c b/arch/arm/mach-zynq/common.c
index f9e5f3a..cd3968c 100644
--- a/arch/arm/mach-zynq/common.c
+++ b/arch/arm/mach-zynq/common.c
@@ -61,15 +61,7 @@
 
 static void __init xilinx_zynq_timer_init(void)
 {
-	struct device_node *np;
-	void __iomem *slcr;
-
-	np = of_find_compatible_node(NULL, NULL, "xlnx,zynq-slcr");
-	slcr = of_iomap(np, 0);
-	WARN_ON(!slcr);
-
-	xilinx_zynq_clocks_init(slcr);
-
+	zynq_slcr_init();
 	clocksource_of_init();
 }