platform/chrome: cros_hps_i2c: make remove callback return void

Commit ed5c2f5f ("i2c: Make remove callback return void") changed
the return type of the 'remove' callback to void, but this driver was
originally written before that change landed. Update the remove callback
to match.

Fixes: 5f995254 ("platform/chrome: add a driver for HPS")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Dan Callaghan <dcallagh@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20221018235237.2274969-1-dcallagh@chromium.org