HID: i2c-hid: Split i2c_hid_hwreset() in start() and finish() functions

Split i2c_hid_hwreset() into:

i2c_hid_start_hwreset() which sends the PWR_ON and reset commands; and
i2c_hid_finish_hwreset() which actually waits for the reset to complete.

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>