ARM: EXYNOS: Add support for mapping PMU base address via DT

Add support for mapping Samsung Power Management Unit (PMU)
base address from device tree.

Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
index 152b464..f8daa9c 100644
--- a/arch/arm/mach-exynos/common.h
+++ b/arch/arm/mach-exynos/common.h
@@ -113,6 +113,7 @@
 
 extern void __iomem *sysram_ns_base_addr;
 extern void __iomem *sysram_base_addr;
+extern void __iomem *pmu_base_addr;
 void exynos_sysram_init(void);
 
 void exynos_firmware_init(void);