edminiv2: switch to SPL

ED Mini V2 is based on Orion 5x which boots at fixed
address 0xFFFF0000 in NOR Flash. Place SPL there, and
switch U-Boot from .bin to .img format, stored in
NOR Flash at 0xFFF90000.

Note: this patch was tested on HW and works, i.e.
it boots U-Boot properly, but SPL console output
currently does not appear, due to GD being trashed
by arch/arm/lib/spl.c. This trashing is soon to be
removed, and then ED Mini V2 SPL console output will
become visible.

Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
diff --git a/arch/arm/mach-orion5x/Kconfig b/arch/arm/mach-orion5x/Kconfig
index 5a54262..291c511 100644
--- a/arch/arm/mach-orion5x/Kconfig
+++ b/arch/arm/mach-orion5x/Kconfig
@@ -5,6 +5,7 @@
 
 config TARGET_EDMINIV2
 	bool "LaCie Ethernet Disk mini V2"
+	select SUPPORT_SPL
 
 endchoice