ARM: uniphier: support eMMC boot for PH1-LD11 and PH1-LD20

The Boot ROM on PH1-LD11/LD20 exports built-in APIs to load images
from an eMMC device.  They are useful to reduce the memory footprint
of SPL, rather than compiling the whole MMC framework.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/include/configs/uniphier.h b/include/configs/uniphier.h
index 10fd8c2..058ccd8 100644
--- a/include/configs/uniphier.h
+++ b/include/configs/uniphier.h
@@ -288,7 +288,9 @@
 #define CONFIG_SPL_FRAMEWORK
 #define CONFIG_SPL_SERIAL_SUPPORT
 #define CONFIG_SPL_NOR_SUPPORT
-#ifndef CONFIG_ARM64
+#ifdef CONFIG_ARM64
+#define CONFIG_SPL_BOARD_LOAD_IMAGE
+#else
 #define CONFIG_SPL_NAND_SUPPORT
 #define CONFIG_SPL_MMC_SUPPORT
 #endif