scons: Move Transform and termcap functionality into their own files.

Change-Id: Ica08e93f3873a7eafd02fe7d44c3bdbf0ce7f6b7
Reviewed-on: https://gem5-review.googlesource.com/5565
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/arch/SConscript

@@ -44,6 +44,8 @@ import sys
 import os
 import re
 
+from gem5_scons import Transform
+
 Import('*')
 
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