kmod_module: use pointer instead of vector for its name

kmod_module: use pointer instead of vector for its name

We still have name allocated just after the struct kmod_module, but
now we use a pointer instead of putting name as a vector in the end of
the structure.

The previous way has some problems, the worst is:
	- it's not possible to swap the name with another value: this is
	  the real problem that this patch is solving. Later patches
	  will make name be swappable with alias, which is not possible
	  if name is a vector.