replace CONFIG_PRELOADER with CONFIG_SPL_BUILD

replace all occurences of CONFIG_PRELOADER with CONFIG_SPL_BUILD

Signed-off-by: Aneesh V <aneesh@ti.com>
diff --git a/onenand_ipl/board/apollon/Makefile b/onenand_ipl/board/apollon/Makefile
index 5397186..3bc9920 100644
--- a/onenand_ipl/board/apollon/Makefile
+++ b/onenand_ipl/board/apollon/Makefile
@@ -4,8 +4,8 @@
 
 LDSCRIPT= $(TOPDIR)/onenand_ipl/board/$(BOARDDIR)/u-boot.onenand.lds
 LDFLAGS	= -Bstatic -T $(onenandobj)u-boot.lds -Ttext $(CONFIG_SYS_TEXT_BASE) $(PLATFORM_LDFLAGS)
-AFLAGS	+= -DCONFIG_PRELOADER -DCONFIG_ONENAND_IPL
-CFLAGS	+= -DCONFIG_PRELOADER -DCONFIG_ONENAND_IPL
+AFLAGS	+= -DCONFIG_SPL_BUILD -DCONFIG_ONENAND_IPL
+CFLAGS	+= -DCONFIG_SPL_BUILD -DCONFIG_ONENAND_IPL
 OBJCFLAGS += --gap-fill=0x00
 
 SOBJS	:= low_levelinit.o