HID: i2c-hid: Fold i2c_hid_execute_reset() into i2c_hid_hwreset()

i2c_hid_hwreset() is the only caller of i2c_hid_execute_reset(),
fold the latter into the former.

This is a preparation patch for removing the need for
I2C_HID_QUIRK_NO_IRQ_AFTER_RESET by making i2c-hid behave
more like Windows.

No functional changes intended.

Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>