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/cpu.c b/arch/arm/mach-orion5x/cpu.c
index f88db3b..2ecd385 100644
--- a/arch/arm/mach-orion5x/cpu.c
+++ b/arch/arm/mach-orion5x/cpu.c
@@ -234,7 +234,9 @@
 	/* Enable and invalidate L2 cache in write through mode */
 	invalidate_l2_cache();
 
+#ifdef CONFIG_SPL_BUILD
 	orion5x_config_adr_windows();
+#endif
 
 	return 0;
 }