uniphier: fix base address of IO block buffer

The current IO block buffer overlaps with BL2 image location.
So, BL2 may corrupt itself.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

plat/socionext/uniphier/include/platform_def.h

@@ -47,7 +47,7 @@
 #define BL32_LIMIT			(UNIPHIER_SEC_DRAM_LIMIT)
 
 #define UNIPHIER_BLOCK_BUF_SIZE		0x00400000
-#define UNIPHIER_BLOCK_BUF_BASE		((BL2_LIMIT) - \
+#define UNIPHIER_BLOCK_BUF_BASE		((BL2_BASE) - \
 					 (UNIPHIER_BLOCK_BUF_SIZE))
 
 #define PLAT_PHY_ADDR_SPACE_SIZE	(1ULL << 32)