staging: rtl8188eu: Remove unused member variables of struct recv_priv

	u64	rx_drop;

	u64	last_rx_bytes;

	uint  rx_icv_err;

	uint  rx_largepacket_crcerr;

	uint  rx_smallpacket_crcerr;

	uint  rx_middlepacket_crcerr;

	uint	ff_hwaddr;

	u8	rx_pending_cnt;

	u8 signal_strength;

	u8 signal_qual;

	u8 noise;

	int RxSNRdB[2];

	s8 RxRssi[2];

	int FalseAlmCnt_all;

	struct timer_list signal_stat_timer;

	u32 signal_stat_sampling_interval;