arm: zynq: Load scu baseaddress at run time

Use Cortex a9 cp15 to read scu baseaddress.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/mach-zynq/common.h b/arch/arm/mach-zynq/common.h
index 5050bb1..d7164d5 100644
--- a/arch/arm/mach-zynq/common.h
+++ b/arch/arm/mach-zynq/common.h
@@ -17,4 +17,6 @@
 #ifndef __MACH_ZYNQ_COMMON_H__
 #define __MACH_ZYNQ_COMMON_H__
 
+extern void __iomem *zynq_scu_base;
+
 #endif