Moved the header files to msm/include/linux.

They can be referenced by #include <linux/queue.h> or <linux/netlock.h>. I hope this means they can be referenced from user space (i.e. they're part of the standard C libraries). Also, it's nicer that there's a single version of those headers, instead of two different ones with the exact same content. That itself was an error waiting to happen.