SN9C10x driver updates:

- Use kzalloc() instead of kmalloc()
- Move some macro definitions from sn9c102.h to sn9c102_core.c
- Use vfree() and vmalloc_32() instead of rvfree() and rvmalloc()
- Fix mmap() sys call
- Documentation updates
Signed-off-by: NLuca Risolia <luca.risolia@studio.unibo.it>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>