2.5.64 changes

[Mark Studebaker]

FYI

Christoph Hellwig <hch at sgi.com>:
                
                          o remove unused variables from the i2c core
                          o remove an unused function from the i2c core
                          o i2c-dev cleanup
                          o remove unused last argument to i2c_register_entry
                          o small i2c-amd8111 updates