[coreboot] PyGen: generation from C code to XML and from XML to C code

[Антон Кочков]

msrtool: add support for code generation from xml files
superiotool: add support for code generation from xml files
Search all *.msr.xml files in directory, creating *.c files from them,
produce *.patch for msrtool.c and msrtool.h
Search all *.sio.xml files in directory, creating *.c files from them
Signed-off-by: Anton Kochkov 
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Next will be gui interface