binman: Add a library to access binman entries

SPL and TPL can access information about binman entries using link-time
symbols but this is not available in U-Boot proper. Of course it could be
made available, but the intention is to just read the device tree.

Add support for this, so that U-Boot can locate entries.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/lib/Makefile b/lib/Makefile
index 1fb650c..7a713a5 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -21,6 +21,7 @@
 obj-y += crypto/
 
 obj-$(CONFIG_AES) += aes.o
+obj-$(CONFIG_$(SPL_TPL_)BINMAN_FDT) += binman.o
 
 ifndef API_BUILD
 ifneq ($(CONFIG_UT_UNICODE)$(CONFIG_EFI_LOADER),)