staging: wlan-ng: Remove unused code

Following structs are defined but never used. Remove such dead code.
	hfa384x_pdr_pcb_partnum
	hfa384x_pdr_pcb_tracenum
	hfa384x_pdr_nic_serial
	hfa384x_pdr_mkk_measurements
	hfa384x_pdr_nic_ramsize
	hfa384x_pdr_refdac_measurements
	hfa384x_pdr_vgdac_measurements
	hfa384x_pdr_level_comp_measurements
	hfa384x_pdr_mac_address
	hfa384x_pdr_mkk_callname
	hfa384x_pdr_regdomain
	hfa384x_pdr_allowed_channel
	hfa384x_pdr_default_channel
	hfa384x_pdr_privacy_option
	hfa384x_pdr_temptype
	hfa384x_pdr_refdac_setup
	hfa384x_pdr_vgdac_setup
	hfa384x_pdr_level_comp_setup
	hfa384x_pdr_trimdac_setup
	hfa384x_pdr_ifr_setting
	hfa384x_pdr_rfr_setting
	hfa384x_pdr_hfa3861_baseline
	hfa384x_pdr_hfa3861_shadow
	hfa384x_pdr_hfa3861_ifrf
	hfa384x_pdr_hfa3861_chcalsp
	hfa384x_pdr_hfa3861_chcali
	hfa384x_pdr_hfa3861_nic_config
	hfa384x_pdr_hfo_delay
	hfa384x_pdr_hfa3861_manf_testsp
	hfa384x_pdr_hfa3861_manf_testi
	hfa384x_pdr_end_of_pda

Signed-off-by: Deepak R Varma <drv@mailo.com>
Link: https://lore.kernel.org/r/Y8d3IOQ8fry2xmz4@ubun2204.myguest.virtualbox.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>