binman: Use the Makefile for u_boot_ucode_ptr

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

Update tools.GetInputFilename() to support reading files from an absolute
path, so that we can read the Elf test files easily. Also make sure that
the temp directory is report in ELF tests as this was commented out.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/ftest.py b/tools/binman/ftest.py
index fad62bb..e7ade0f 100644
--- a/tools/binman/ftest.py
+++ b/tools/binman/ftest.py
@@ -152,8 +152,8 @@
         elf_test.BuildElfTestFiles(cls._elf_testdir)
 
         # ELF file with a '_dt_ucode_base_size' symbol
-        with open(cls.TestFile('u_boot_ucode_ptr'), 'rb') as fd:
-            TestFunctional._MakeInputFile('u-boot', fd.read())
+        TestFunctional._MakeInputFile('u-boot',
+            tools.ReadFile(cls.ElfTestFile('u_boot_ucode_ptr')))
 
         # Intel flash descriptor file
         with open(cls.TestFile('descriptor.bin'), 'rb') as fd:
@@ -489,7 +489,7 @@
             Filename of ELF file to use as SPL
         """
         # TODO(sjg@chromium.org): Drop this when all Elf files use ElfTestFile()
-        if src_fname in ['bss_data']:
+        if src_fname in ['bss_data', 'u_boot_ucode_ptr']:
             fname = cls.ElfTestFile(src_fname)
         else:
             fname = cls.TestFile(src_fname)
@@ -1101,8 +1101,8 @@
 
         finally:
             # Put the original file back
-            with open(self.TestFile('u_boot_ucode_ptr'), 'rb') as fd:
-                TestFunctional._MakeInputFile('u-boot', fd.read())
+            TestFunctional._MakeInputFile('u-boot',
+                tools.ReadFile(self.ElfTestFile('u_boot_ucode_ptr')))
 
     def testMicrocodeNotInImage(self):
         """Test that microcode must be placed within the image"""
@@ -1818,8 +1818,8 @@
             u-boot-tpl.dtb with the microcode removed
             the microcode
         """
-        with open(self.TestFile('u_boot_ucode_ptr'), 'rb') as fd:
-            TestFunctional._MakeInputFile('tpl/u-boot-tpl', fd.read())
+        TestFunctional._MakeInputFile('tpl/u-boot-tpl',
+            tools.ReadFile(self.ElfTestFile('u_boot_ucode_ptr')))
         first, pos_and_size = self._RunMicrocodeTest('093_x86_tpl_ucode.dts',
                                                      U_BOOT_TPL_NODTB_DATA)
         self.assertEqual(b'tplnodtb with microc' + pos_and_size +