qcacld-3.0: Remove enum hdd_auth_key_mgmt

The last usage of enum hdd_auth_key_mgmt was removed with the patch:
    Change-Id I2934e4a867458561c50170b0e786e63f20f1af4a
    qcacld-3.0: Code cleanup for connection manager in HDD

Since this is unused, remove it.

Change-Id: I96a2f82e229ca73061da3ed781518d43c940cfa7
CRs-Fixed: 3422049

core/hdd/inc/wlan_hdd_main.h

@@ -462,18 +462,6 @@ enum hdd_nb_cmd_id {
 
 #define INTF_MACADDR_MASK       0x7
 
-/**
- * enum hdd_auth_key_mgmt - auth key mgmt protocols
- * @HDD_AUTH_KEY_MGMT_802_1X: 802.1x
- * @HDD_AUTH_KEY_MGMT_PSK: PSK
- * @HDD_AUTH_KEY_MGMT_CCKM: CCKM
- */
-enum hdd_auth_key_mgmt {
-	HDD_AUTH_KEY_MGMT_802_1X = BIT(0),
-	HDD_AUTH_KEY_MGMT_PSK = BIT(1),
-	HDD_AUTH_KEY_MGMT_CCKM = BIT(2)
-};
-
 /**
  * typedef wlan_net_dev_ref_dbgid - Debug IDs to detect net device reference
  *                                  leaks.