Remove the TWSI code.  The driver now uses the kernel's built-in
i2c bit bus module.

Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: NEaswar Hariharan <easwar.hariharan@intel.com>
Reviewed-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NDean Luick <dean.luick@intel.com>
Signed-off-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>