platform/chrome: cros_ec: let cros_ec_suspend() call cros_ec_suspend_*

platform/chrome: cros_ec: let cros_ec_suspend() call cros_ec_suspend_*

After commit 2fbe479c0024 ("platform/chrome: cros_ec: Handle events
during suspend after resume completion"), cros_ec_resume() starts to
call cros_ec_resume_early() and cros_ec_resume_complete().

To be neat, let cros_ec_suspend() call cros_ec_suspend_prepare() and
cros_ec_suspend_late().

Reviewed-by: Prashant Malani <pmalani@chromium.org>
Link: https://lore.kernel.org/r/20240430020924.610724-1-tzungbi@kernel.org
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>