arm: db-mv784mp-gp: Enable SPL to include DDR training code into U-Boot

This patch adds SPL support to the db-mv784mp-gp eval board.

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Luka Perkov <luka.perkov@sartura.hr>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 27b38df..47806f8 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -236,6 +236,7 @@
 config TARGET_DB_MV784MP_GP
 	bool "Support db-mv784mp-gp"
 	select CPU_V7
+	select SUPPORT_SPL
 
 config TARGET_MAXBCM
 	bool "Support maxbcm"