msrtool: 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
Signed-off-by: Anton Kochkov <anton.kochkov(a)gmail.com>
---
Small fixes, included export_msr.c file, which produce *.msr.xml files
from existing code