ARM1136: Introduce CONFIG_PRELOADER macro.

Currently CONFIG_ONENAND_IPL is used in a number of #ifdef's
in start.S. In preparation for adding support for NAND SPL
the macro CONFIG_PRELOADER is introducted and replaces the
CONFIG_ONENAND_IPL in start.S.

Signed-off-by: Magnus Lilja <lilja.magnus@gmail.com>
diff --git a/onenand_ipl/board/apollon/Makefile b/onenand_ipl/board/apollon/Makefile
index f6c36ec..49a8e90 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 $(LDSCRIPT) -Ttext $(TEXT_BASE) $(PLATFORM_LDFLAGS)
-AFLAGS	+= -DCONFIG_ONENAND_IPL
-CFLAGS	+= -DCONFIG_ONENAND_IPL
+AFLAGS	+= -DCONFIG_PRELOADER -DCONFIG_ONENAND_IPL
+CFLAGS	+= -DCONFIG_PRELOADER -DCONFIG_ONENAND_IPL
 OBJCFLAGS += --gap-fill=0x00
 
 SOBJS	:= low_levelinit.o