Divides variable of linker flags to LDFLAGS-u-boot and LDFLAGS

Linker needs to use the proper endian/bfd flags even when doing partial linking.
LDFLAGS_u-boot sets linker option which is called it when U-boot is built
(u-boot final).
LDFLAGS sets necessary option by partial linking (use in cmd_link_o_target).

CC: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/config.mk b/config.mk
index 66f8fe6..5147c35 100644
--- a/config.mk
+++ b/config.mk
@@ -204,9 +204,11 @@
 
 AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
 
-LDFLAGS += -Bstatic -T $(obj)u-boot.lds $(PLATFORM_LDFLAGS)
+LDFLAGS += $(PLATFORM_LDFLAGS)
+
+LDFLAGS_u-boot += -Bstatic -T $(obj)u-boot.lds $(PLATFORM_LDFLAGS)
 ifneq ($(CONFIG_SYS_TEXT_BASE),)
-LDFLAGS += -Ttext $(CONFIG_SYS_TEXT_BASE)
+LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
 endif
 
 # Location of a usable BFD library, where we define "usable" as
@@ -259,7 +261,7 @@
 
 # If the list of objects to link is empty, just create an empty built-in.o
 cmd_link_o_target = $(if $(strip $1),\
-		      $(LD) -r -o $@ $1 ,\
+		      $(LD) $(LDFLAGS) -r -o $@ $1,\
 		      rm -f $@; $(AR) rcs $@ )
 
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