Misra: Add tools and description to use cppcheck
Add a python script transforming the Zephyr coding guidelines into a cppcheck compatible list of misra rules description.
Add a README file describing how to generate the rules and run cppcheck.
Add a patch to add cppcheck support to Xen.
Update Zephyr Coding guidelines to the latest one from Master
Signed-off-by: Bertrand Marquis bertrand.marquis@arm.com