power: supply: cros_charge-control: allow start_threshold == end_threshold

Allow setting the start and stop thresholds to the same value.
There is no reason to disallow it.

Suggested-by: Thomas Koch <linrunner@gmx.net>
Fixes: c6ed48ef ("power: supply: add ChromeOS EC based charge control driver")
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20241208-cros_charge-control-v2-v1-2-8d168d0f08a3@weissschuh.net


Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>