rockchip: rk3288: add boot_devices mapping to support 'same-as-spl'

The driver need a mapping to get the dts node by boot srouce ID.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/rk3288/rk3288.c b/arch/arm/mach-rockchip/rk3288/rk3288.c
index 0a185d6..04a87d6 100644
--- a/arch/arm/mach-rockchip/rk3288/rk3288.c
+++ b/arch/arm/mach-rockchip/rk3288/rk3288.c
@@ -4,6 +4,7 @@
  */
 #include <asm/armv7.h>
 #include <asm/io.h>
+#include <asm/arch-rockchip/bootrom.h>
 #include <asm/arch-rockchip/hardware.h>
 #include <asm/arch-rockchip/grf_rk3288.h>
 #include <asm/arch-rockchip/pmu_rk3288.h>
@@ -13,6 +14,11 @@
 
 #define GRF_BASE	0xff770000
 
+const char * const boot_devices[BROM_LAST_BOOTSOURCE + 1] = {
+	[BROM_BOOTSOURCE_EMMC] = "dwmmc@ff0f0000",
+	[BROM_BOOTSOURCE_SD] = "dwmmc@ff0c0000",
+};
+
 #ifdef CONFIG_SPL_BUILD
 static void configure_l2ctlr(void)
 {