ARM: atmel: sama5d4_xplained: enable spl support

Signed-off-by: Bo Shen <voice.shen@atmel.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 8be14fe..5cfca1b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -525,6 +525,7 @@
 config TARGET_SAMA5D4_XPLAINED
 	bool "Support sama5d4_xplained"
 	select CPU_V7
+	select SUPPORT_SPL
 
 config TARGET_SAMA5D4EK
 	bool "Support sama5d4ek"