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/rk3128_common.h b/include/configs/rk3128_common.h
index 20d6243..d12696d 100644
--- a/include/configs/rk3128_common.h
+++ b/include/configs/rk3128_common.h
@@ -19,6 +19,8 @@
 #define CONFIG_SYS_ARCH_TIMER
 #define CONFIG_SYS_HZ_CLOCK		24000000
 
+#define CONFIG_IRAM_BASE		0x10080000
+
 #define CONFIG_SYS_INIT_SP_ADDR		0x60100000
 #define CONFIG_SYS_LOAD_ADDR		0x60800800