iwlagn: add 2000 series to Kconfig

Add 2000 series support to Kconfig
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

drivers/net/wireless/iwlwifi/Kconfig

@@ -113,6 +113,7 @@ config IWL5000
 		Intel 6000 Gen 2 Series Wi-Fi Adapters (6000G2A and 6000G2B)
 		Intel WIreless WiFi Link 6050BGN Gen 2 Adapter
 		Intel 100 Series Wi-Fi Adapters (100BGN and 130BGN)
+		Intel 2000 Series Wi-Fi Adapters
 
 config IWL3945
 	tristate "Intel PRO/Wireless 3945ABG/BG Network Connection (iwl3945)"