iwlwifi-5000: add run time calibrations for 5000

This patch adds support for run time calibrations for the 5000 family HW.
Those calibrations are sensitivity calibration, and chain noise calibration.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>