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/rk3188_common.h b/include/configs/rk3188_common.h
index ec90088..92524b0 100644
--- a/include/configs/rk3188_common.h
+++ b/include/configs/rk3188_common.h
@@ -23,6 +23,7 @@
 
 #define CONFIG_ROCKCHIP_MAX_INIT_SIZE	(0x8000 - 0x800)
 #define CONFIG_ROCKCHIP_CHIP_TAG	"RK31"
+#define CONFIG_IRAM_BASE	0x10080000
 
 /* spl size 32kb sram - 2kb bootrom */
 #define CONFIG_SPL_MAX_SIZE		(0x8000 - 0x800)