sunxi: Add H3 DRAM initialization support

Based on existing A23/A33 code and the original H3 boot0.

Signed-off-by: Jens Kuske <jenskuske@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
index e1f574f..2dd9d3b 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -72,6 +72,7 @@
 	bool "sun8i (Allwinner H3)"
 	select CPU_V7
 	select SUNXI_GEN_SUN6I
+	select SUPPORT_SPL
 
 config MACH_SUN9I
 	bool "sun9i (Allwinner A80)"