rockchip: rk3588: Add boot device detection

Enable SPL on RK3588 to detect which device it was booted from.
Fixes use of same-as-spl in u-boot,spl-boot-order prop.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/rk3588/rk3588.c b/arch/arm/mach-rockchip/rk3588/rk3588.c
index 2ee1db4..18e67b5 100644
--- a/arch/arm/mach-rockchip/rk3588/rk3588.c
+++ b/arch/arm/mach-rockchip/rk3588/rk3588.c
@@ -8,6 +8,7 @@
 #include <spl.h>
 #include <asm/armv8/mmu.h>
 #include <asm/io.h>
+#include <asm/arch-rockchip/bootrom.h>
 #include <asm/arch-rockchip/hardware.h>
 #include <asm/arch-rockchip/ioc_rk3588.h>
 
@@ -36,6 +37,12 @@
 #define BUS_IOC_GPIO2D_IOMUX_SEL_H	0x5c
 #define BUS_IOC_GPIO3A_IOMUX_SEL_L	0x60
 
+const char * const boot_devices[BROM_LAST_BOOTSOURCE + 1] = {
+	[BROM_BOOTSOURCE_EMMC] = "/mmc@fe2e0000",
+	[BROM_BOOTSOURCE_SPINOR] = "/spi@fe2b0000/flash@0",
+	[BROM_BOOTSOURCE_SD] = "/mmc@fe2c0000",
+};
+
 static struct mm_region rk3588_mem_map[] = {
 	{
 		.virt = 0x0UL,