mtip32xx: removed the irrelevant argument of mtip_hw_submit_io() and the unused member of struct driver_data

Removed the following:
	* irrelevant argument 'barrier' of mtip_hw_submit_io()
	* unused member 'eh_active' of struct driver_data
Signed-off-by: NAsai Thambi S P <asamymuthupa@micron.com>
Signed-off-by: NSam Bradshaw <sbradshaw@micron.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>