Makefile.spl: Move generated AT91SAM NAND image boot.bin to spl directory

This patch moves the AT91SAM NAND booting SPL image "boot.bin" which
includes the ECC values from the root directory into the spl directory,
where all SPL related images are located.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Heiko Schocher <hs@denx.de>
Cc: Andreas Bießmann <andreas@biessmann.org>
Cc: Eugen Hristev <eugen.hristev@microchip.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Tested on the taurus board:
Tested-by: Heiko Schocher <hs@denx.de>
diff --git a/scripts/Makefile.spl b/scripts/Makefile.spl
index 54b160d..56dbbe1 100644
--- a/scripts/Makefile.spl
+++ b/scripts/Makefile.spl
@@ -179,10 +179,10 @@
 ifeq ($(CONFIG_SPL_GENERATE_ATMEL_PMECC_HEADER),y)
 MKIMAGEFLAGS_boot.bin += -n $(shell $(obj)/../tools/atmel_pmecc_params)
 
-boot.bin: $(obj)/../tools/atmel_pmecc_params
+$(obj)/boot.bin: $(obj)/../tools/atmel_pmecc_params
 endif
 
-boot.bin: $(obj)/u-boot-spl.bin FORCE
+$(obj)/boot.bin: $(obj)/u-boot-spl.bin FORCE
 	$(call if_changed,mkimage)
 else
 ifdef CONFIG_ARCH_ZYNQ
@@ -225,7 +225,7 @@
 endif
 
 ifeq ($(CONFIG_SYS_SOC),"at91")
-ALL-y	+= boot.bin
+ALL-y	+= $(obj)/boot.bin
 endif
 
 ALL-$(CONFIG_SPL_X86_16BIT_INIT) += $(obj)/u-boot-x86-16bit-spl.bin