global: Migrate CONFIG_IRAM_TOP to CFG

Perform a simple rename of CONFIG_IRAM_TOP to CFG_IRAM_TOP

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/exynos5420-common.h b/include/configs/exynos5420-common.h
index 934a4ef..99ab1a1 100644
--- a/include/configs/exynos5420-common.h
+++ b/include/configs/exynos5420-common.h
@@ -8,7 +8,7 @@
 #ifndef __CONFIG_EXYNOS5420_H
 #define __CONFIG_EXYNOS5420_H
 
-#define CONFIG_IRAM_TOP			0x02074000
+#define CFG_IRAM_TOP			0x02074000
 
 #define CONFIG_PHY_IRAM_BASE		0x02020000