binman: Correct testSplNoDtb() and Tpl also

These two tests require an ELF image so that symbol information can be
written into the SPL/TPL binary. At present they rely on other tests
having set it up first, but every test must run independently. This can
cause occasional errors in CI.

Fix this by setting up the required files, as other tests do.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

tools/binman/ftest.py

@@ -1341,6 +1341,7 @@ class TestFunctional(unittest.TestCase):
 
     def testSplNoDtb(self):
         """Test that an image with spl/u-boot-spl-nodtb.bin can be created"""
+        self._SetupSplElf()
         data = self._DoReadFile('052_u_boot_spl_nodtb.dts')
         self.assertEqual(U_BOOT_SPL_NODTB_DATA, data[:len(U_BOOT_SPL_NODTB_DATA)])
 
@@ -4272,6 +4273,7 @@ class TestFunctional(unittest.TestCase):
 
     def testTplNoDtb(self):
         """Test that an image with tpl/u-boot-tpl-nodtb.bin can be created"""
+        self._SetupTplElf()
         data = self._DoReadFile('192_u_boot_tpl_nodtb.dts')
         self.assertEqual(U_BOOT_TPL_NODTB_DATA,
                          data[:len(U_BOOT_TPL_NODTB_DATA)])