qcacmn: Add support for 'he_ltf' command

Currently, we do not have support for 'he_ltf' command. But we need
this command for certain IOP testcases. Add support for 'he_ltf'
command.

Change-Id: I296b18762aaa52da80a5755c5bcca8dbd12d9b13
CRs-fixed: 2118948

wmi_unified_param.h

@@ -5400,6 +5400,7 @@ typedef enum {
 	wmi_vdev_param_he_bss_color,
 	wmi_vdev_param_he_range_ext_enable,
 	wmi_vdev_param_set_hemu_mode,
+	wmi_vdev_param_set_he_ltf,
 
 	wmi_vdev_param_max,
 } wmi_conv_vdev_param_id;