Blackfin: unify bootmode based LDR_FLAGS setup

Unify this convention for all Blackfin boards.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/config.mk b/arch/blackfin/config.mk
index 92520e8..4102c6f 100644
--- a/arch/blackfin/config.mk
+++ b/arch/blackfin/config.mk
@@ -67,6 +67,9 @@
 
 LDR_FLAGS += $(LDR_FLAGS-y)
 
+# Set some default LDR flags based on boot mode.
+LDR_FLAGS += $(LDR_FLAGS-$(CONFIG_BFIN_BOOT_MODE))
+
 ifeq ($(wildcard $(TOPDIR)/board/$(BOARD)/u-boot.lds*),)
 LDSCRIPT = $(obj)arch/$(ARCH)/lib/u-boot.lds.S
 endif