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/arch/arm/lib/board.c b/arch/arm/lib/board.c
index 6bbedf4..bcbf697 100644
--- a/arch/arm/lib/board.c
+++ b/arch/arm/lib/board.c
@@ -364,7 +364,7 @@
 
 	debug ("Reserving %ldk for U-Boot at: %08lx\n", gd->mon_len >> 10, addr);
 
-#ifndef CONFIG_PRELOADER
+#ifndef CONFIG_SPL_BUILD
 	/*
 	 * reserve memory for malloc() arena
 	 */