Introduce a new linker flag LDFLAGS_FINAL

commit 8aba9dceebb14144e07d19593111ee3a999c37fc
Divides variable of linker flags to LDFLAGS-u-boot and LDFLAGS

breaks the usage of --gc-section to build nand_spl. We still need linker option
--gc-section for every uboot image, not only the main one. LDFLAGS_FINAL passes
the --gc-sections to each uboot image.

To get the proper linker flags, we use LDFLAGS and LDFLAGS_FINAL to replace
PLATFORM_LDFLAGS in the Makefile of each nand_spl board.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Haiying Wang <Haiying.Wang@freescale.com>
diff --git a/config.mk b/config.mk
index 401dc2e..fa46ff1 100644
--- a/config.mk
+++ b/config.mk
@@ -206,8 +206,9 @@
 AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
 
 LDFLAGS += $(PLATFORM_LDFLAGS)
+LDFLAGS_FINAL += -Bstatic
 
-LDFLAGS_u-boot += -Bstatic -T $(obj)u-boot.lds $(PLATFORM_LDFLAGS)
+LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL)
 ifneq ($(CONFIG_SYS_TEXT_BASE),)
 LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
 endif