staging/rdma/hfi1: Extend quiet timeout

The longest quiet timeout is now 6s.  Extend the driver wait to 6s.

The driver wasn't following our internal specification: 6 seconds.
This patch corrects that issue.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>