binman: Add a ProcessFdt() method

Some entry types modify the device tree, e.g. to remove microcode or add a
property. So far this just modifies their local copy and does not affect
a 'shared' device tree.

Rather than doing this modification in the ObtainContents() method, and a
new ProcessFdt() method which is specifically designed to modify this
shared device tree.

Move the existing device-tree code over to use this method, reducing
ObtainContents() to the goal of just obtaining the contents without any
processing, even for device tree.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/image.py b/tools/binman/image.py
index 835b66c..9732493 100644
--- a/tools/binman/image.py
+++ b/tools/binman/image.py
@@ -54,6 +54,9 @@
             self._filename = filename
         self._section = bsection.Section('main-section', self._node)
 
+    def ProcessFdt(self, fdt):
+        return self._section.ProcessFdt(fdt)
+
     def GetEntryContents(self):
         """Call ObtainContents() for the section
         """