clocksource/drivers/timer-tegra186: Don't print superfluous errors

The watchdog core will handle error messages already.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Link: https://lore.kernel.org/r/20250813190657.3628-2-wsa+renesas@sang-engineering.com