dtoc: Don't handle properties with / in them

This conversion appears to not be needed as it does not occur in practice.
Drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/dtoc/dtb_platdata.py b/tools/dtoc/dtb_platdata.py
index 75adf48..d86651b 100644
--- a/tools/dtoc/dtb_platdata.py
+++ b/tools/dtoc/dtb_platdata.py
@@ -55,7 +55,6 @@
     new = new.replace('-', '_')
     new = new.replace(',', '_')
     new = new.replace('.', '_')
-    new = new.replace('/', '__')
     return new
 
 def tab_to(num_tabs, line):