Limit of the scope of private functions

[dariusz-f]

A lot of functions are visible public but this isn't necessary.
nm libxeve.so
Now most of functions are global, we may limit scope of functions to show only necessary public API, and rest of them make for example static to limit their range.

It will be desired to make code refactoring.
Also the same should be done in xevd.

[dkozinski]

For example, the functions xeve_mc_dmvr* defined in the xevem_mc_sse.c file. They are only used in this file, so we can limit their scope.