iwlwifi: move ucode loading related code to separated file

Multiple iwlagn based devices shared the same ucode loading procedure.
Move loading related code from iwl-5000.c to iwl-agn-ucode.c file.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-1000.c b/drivers/net/wireless/iwlwifi/iwl-1000.c
index 9e39289..ad61464 100644
--- a/drivers/net/wireless/iwlwifi/iwl-1000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-1000.c
@@ -218,7 +218,7 @@
 };
 
 static const struct iwl_ops iwl1000_ops = {
-	.ucode = &iwl5000_ucode,
+	.ucode = &iwlagn_ucode,
 	.lib = &iwl1000_lib,
 	.hcmd = &iwl5000_hcmd,
 	.utils = &iwl5000_hcmd_utils,