binman: Use the Makefile for u_boot_binman_syms_size

Remove this file from git and instead build it using the Makefile.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/ftest.py b/tools/binman/ftest.py
index 507c481..51eab6f 100644
--- a/tools/binman/ftest.py
+++ b/tools/binman/ftest.py
@@ -490,7 +490,7 @@
         """
         # TODO(sjg@chromium.org): Drop this when all Elf files use ElfTestFile()
         if src_fname in ['bss_data', 'u_boot_ucode_ptr', 'u_boot_no_ucode_ptr',
-                         'u_boot_binman_syms']:
+                         'u_boot_binman_syms', 'u_boot_binman_syms_size']:
             fname = cls.ElfTestFile(src_fname)
         else:
             fname = cls.TestFile(src_fname)