arm, spl, at91: add at91sam9260 and at91sam9g45 spl support

add support for using spl code on at91sam9260 and at91sam9g45
based boards.

Signed-off-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Bo Shen <voice.shen@atmel.com>
Reviewed-by: Andreas Bießmann <andreas.devel@googlemail.com>
[adopt Bo's change in spl.c]
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/arch/arm/cpu/at91-common/Makefile b/arch/arm/cpu/at91-common/Makefile
index f62863a..89e1577 100644
--- a/arch/arm/cpu/at91-common/Makefile
+++ b/arch/arm/cpu/at91-common/Makefile
@@ -10,7 +10,8 @@
 
 obj-$(CONFIG_AT91_WANTS_COMMON_PHY) += phy.o
 ifneq ($(CONFIG_SPL_BUILD),)
-obj-$(CONFIG_AT91SAM9M10G45) += mpddrc.o
-obj-$(CONFIG_SAMA5D3) += mpddrc.o
+obj-$(CONFIG_AT91SAM9G20) += sdram.o spl_at91.o
+obj-$(CONFIG_AT91SAM9M10G45) += mpddrc.o spl_at91.o
+obj-$(CONFIG_SAMA5D3) += mpddrc.o spl_atmel.o
 obj-y += spl.o
 endif