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/mmc_spl/board/samsung/smdkv310/Makefile b/mmc_spl/board/samsung/smdkv310/Makefile
index f1ce066..de2c1a2 100644
--- a/mmc_spl/board/samsung/smdkv310/Makefile
+++ b/mmc_spl/board/samsung/smdkv310/Makefile
@@ -35,7 +35,7 @@
 LDFLAGS	= -Bstatic -T $(mmcobj)u-boot.lds -Ttext $(CONFIG_SYS_TEXT_BASE) $(PLATFORM_LDFLAGS)
 AFLAGS	+= -DCONFIG_MMC_SPL
 CFLAGS	+= -DCONFIG_MMC_SPL
-CFLAGS	+= -DCONFIG_PRELOADER
+CFLAGS	+= -DCONFIG_SPL_BUILD
 
 SOBJS	= start.o mem_setup.o lowlevel_init.o
 COBJS	= mmc_boot.o