rockchip: intruduce common BROM_BOOTSOURCE_ID_ADDR

The boot source from BootRom is store at a fix offset of IRAM,
update to use the common macro instead of rk3399 specific one.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/include/asm/arch-rockchip/bootrom.h b/arch/arm/include/asm/arch-rockchip/bootrom.h
index d67f43f..3499227 100644
--- a/arch/arm/include/asm/arch-rockchip/bootrom.h
+++ b/arch/arm/include/asm/arch-rockchip/bootrom.h
@@ -55,6 +55,6 @@
 /**
  * Locations of the boot-device identifier in SRAM
  */
-#define RK3399_BROM_BOOTSOURCE_ID_ADDR   0xff8c0010
+#define BROM_BOOTSOURCE_ID_ADDR   (CONFIG_IRAM_BASE + 0x10)
 
 #endif
diff --git a/arch/arm/mach-rockchip/rk3399-board-spl.c b/arch/arm/mach-rockchip/rk3399-board-spl.c
index 7154d8e..3624c8e 100644
--- a/arch/arm/mach-rockchip/rk3399-board-spl.c
+++ b/arch/arm/mach-rockchip/rk3399-board-spl.c
@@ -35,7 +35,7 @@
 
 const char *board_spl_was_booted_from(void)
 {
-	u32  bootdevice_brom_id = readl(RK3399_BROM_BOOTSOURCE_ID_ADDR);
+	u32  bootdevice_brom_id = readl(BROM_BOOTSOURCE_ID_ADDR);
 	const char *bootdevice_ofpath = NULL;
 
 	if (bootdevice_brom_id < ARRAY_SIZE(boot_devices))