tpm: drop the field 'time_expired' from struct tpm_chip

Removed the field because it is not used for anything.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>

drivers/char/tpm/tpm.h

@@ -174,7 +174,6 @@ struct tpm_chip {
 
 	int dev_num;		/* /dev/tpm# */
 	unsigned long is_open;	/* only one allowed */
-	int time_expired;
 
 	struct mutex tpm_mutex;	/* tpm is processing */