iwlwifi: move iwl4965_init_alive_start to iwl-4965.c

This patch moves iwl_4965_init_alive_start to iwl-4965.c.

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>