Makefile: Move SPL files to clobber, remove from clean

The 'clean' target has been removing all of spl but not u-boot itself.
For consistency and ease of testing, only remove SPL binaries / maps in
the clobber target, just like for full U-Boot

Signed-off-by: Tom Rini <trini@ti.com>

Makefile

@@ -791,10 +791,6 @@ clean:
 	@rm -f $(obj)lib/asm-offsets.s
 	@rm -f $(obj)include/generated/asm-offsets.h
 	@rm -f $(obj)$(CPUDIR)/$(SOC)/asm-offsets.s
-	@rm -f $(obj)nand_spl/{u-boot.lds,u-boot-nand_spl.lds,u-boot-spl,u-boot-spl.map,System.map}
-	@rm -f $(ONENAND_BIN)
-	@rm -f $(obj)spl/{u-boot-spl,u-boot-spl.bin,u-boot-spl.lds,u-boot-spl.map}
-	@rm -f $(obj)MLO
 	@rm -f $(TIMESTAMP_FILE) $(VERSION_FILE)
 	@find $(OBJTREE) -type f \
 		\( -name 'core' -o -name '*.bak' -o -name '*~' -o -name '*.su' \
@@ -820,6 +816,9 @@ clobber:	tidy
 	@rm -f $(obj)u-boot.dtb
 	@rm -f $(obj)u-boot.sb
 	@rm -f $(obj)u-boot.spr
+	@rm -f $(obj)nand_spl/{u-boot.lds,u-boot-nand_spl.lds,u-boot-spl,u-boot-spl.map,System.map}
+	@rm -f $(obj)spl/{u-boot-spl,u-boot-spl.bin,u-boot-spl.lds,u-boot-spl.map}
+	@rm -f $(obj)MLO
 	@rm -f $(obj)tools/xway-swap-bytes
 	@rm -f $(obj)arch/powerpc/cpu/mpc824x/bedbug_603e.c
 	@rm -f $(obj)arch/powerpc/cpu/mpc83xx/ddr-gen?.c