rockchip: add CONFIG_IRAM_BASE for all SoCs

Rockchip SoCs have internal sram for bootrom data area and for
sdram init program space. Introduce the base address in case
we need to use it.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/include/configs/rk3328_common.h b/include/configs/rk3328_common.h
index 3a8e37e..1cf45bb 100644
--- a/include/configs/rk3328_common.h
+++ b/include/configs/rk3328_common.h
@@ -8,6 +8,8 @@
 
 #include "rockchip-common.h"
 
+#define CONFIG_IRAM_BASE		0xff090000
+
 #define CONFIG_SYS_MALLOC_LEN		(32 << 20)
 #define CONFIG_SYS_CBSIZE		1024
 #define CONFIG_SKIP_LOWLEVEL_INIT