iwlwifi: 3945 remove iwl-3945-commands.h

This patch remove iwl-3945-commands.h
eliminating duplicated and moving all definitions to iwl-commands.h

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>