ARM: uniphier: add ProXstream2 and PH1-LD6b support

The DDR SDRAM initialization code has not been mainlined yet, but
U-Boot proper should work.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-uniphier/boot-mode/boot-mode.c b/arch/arm/mach-uniphier/boot-mode/boot-mode.c
index 60329eb..c6cafa7 100644
--- a/arch/arm/mach-uniphier/boot-mode/boot-mode.c
+++ b/arch/arm/mach-uniphier/boot-mode/boot-mode.c
@@ -33,6 +33,12 @@
 	case SOC_UNIPHIER_PH1_PRO5:
 		return ph1_pro5_boot_device();
 #endif
+#if defined(CONFIG_ARCH_UNIPHIER_PROXSTREAM2) || \
+	defined(CONFIG_ARCH_UNIPHIER_PH1_LD6B)
+	case SOC_UNIPHIER_PROXSTREAM2:
+	case SOC_UNIPHIER_PH1_LD6B:
+		return proxstream2_boot_device();
+#endif
 	default:
 		return BOOT_DEVICE_NONE;
 	}