irda: Removed all unused timeval variables

In the file au1k_ir.c & via-ircc.h, there were two unused definitions of the
timeval type members, this commit therefore removes this unneeded code.

In other three files, the same problem is the rx_time member is only ever
written, never read, so removed it entirely.

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/irda/mcs7780.h

@@ -116,7 +116,6 @@ struct mcs_cb {
 	__u8 *fifo_status;
 
 	iobuff_t rx_buff;	/* receive unwrap state machine */
-	struct timeval rx_time;
 	spinlock_t lock;
 	int receiving;