IB/hfi1: Extend i2c timeout

Allow a longer timeout for i2c due to clock stretching and
inaccurate jiffy timing when under a spin lock.  This timeout
is consistent with other i2c-algo-bit users.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>