i2c: i801: Drop two outdated comments

* Timeouts are reported even in interrupt mode since commit
  b3b8df97 ("i2c: i801: Use wait_event_timeout to wait for
  interrupts") so drop the comment which claims this only happens in
  polled mode.
* xact does not include the PEC bit, as the driver does not support
  software PEC.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>